in tandem

in tandem — idiom

1. If two or more people, groups, or things work in tandem, they act together in a

1.idiomB2
Definition

If two or more people, groups, or things work in tandem, they act together in a closely coordinated way, combining their efforts toward a shared purpose — for example, two departments launching a product together, or two musicians performing a piece with perfectly matched timing.

Example

The marketing and design teams worked in tandem to launch the new app before the holiday season.

work in tandem + infinitive of purpose

Dr. Manuela and the nursing staff worked in tandem throughout the emergency to stabilise the injured passengers.

Common collocations
  • work in tandem
  • operate in tandem
  • run in tandem
  • act in tandem
  • in tandem with
Synonyms
  • together

    more general; 'in tandem' adds a sense of close coordination

  • jointly

    more formal; often used in legal or business contexts

  • cooperatively

    emphasises willingness to help each other

  • in partnership

    implies a formal or structured arrangement

Antonyms

Grammar Patterns

A and B work in tandem

A works in tandem with B

Usage Note

Often followed by 'with' to introduce the person or group that is being coordinated with: 'The police worked in tandem with local security teams.' Adding 'each other' after 'in tandem' is redundant and grammatically incorrect.

Common Mistakes

The two departments worked in tandem each other to finish the project.
The two departments worked in tandem to finish the project.
'in tandem' already carries the meaning of 'together', so 'each other' is unnecessary.
She worked in tandem with together the marketing team.
She worked in tandem with the marketing team.
Adding 'together' is redundant since 'in tandem' already means 'together'.

2. Used to describe two events, changes, or processes that happen at the same time,

2.idiomB2
Definition

Used to describe two events, changes, or processes that happen at the same time, often in a way that is connected or influences each other — for example, prices rising at the same time as wages, or two cultural events taking place on the same weekend.

Example

Wages and living costs have risen in tandem over the past five years.

rise in tandem

The music festival and the art exhibition ran in tandem that weekend, so Kian bought tickets to both.

Common collocations
  • rise in tandem
  • grow in tandem
  • occur in tandem
  • happen in tandem
  • in tandem with
Synonyms
Antonyms

Grammar Patterns

X and Y happen/occur in tandem

X happens in tandem with Y

Usage Note

This sense focuses on simultaneity rather than cooperation. If the emphasis is on coordination between active participants, use sense 1 (WORKING TOGETHER) instead.

Common Mistakes

Prices rose in tandem with together the rise in demand.
Prices rose in tandem with the rise in demand.
'Together' is redundant after 'in tandem'.

3. Physically positioned or arranged so that one person or thing is directly behind

3.idiomC1
Definition

Physically positioned or arranged so that one person or thing is directly behind another, as in a tandem bicycle (built for two riders, one behind the other) or a team of horses harnessed one after the other rather than side by side.

Example

The children rode a bicycle built for two, sitting in tandem behind their father on the front seat.

sit in tandem

The horses pulled the carriage in tandem, with the lead horse directly in front of the second horse.

Common collocations
  • sit in tandem
  • ride in tandem
  • arranged in tandem
  • jump in tandem
Synonyms
Antonyms
  • side by side

    arranged next to each other rather than one behind the other

Grammar Patterns

sit/ride/jump in tandem

arranged in tandem

Usage Note

This is the oldest sense of 'in tandem', referring to the original tandem carriage design (horses harnessed one in front of the other). Today it is used mainly in specific contexts such as cycling (tandem bicycles), skydiving (tandem jumps), or any physical arrangement where items follow one after another in a line.

Synonym discussion

Sense: idiom/1

All five expressions describe people or groups acting with one another, but they differ in nuance and register. 'Together' is the most general and everyday word, covering any situation from two friends walking together to entire nations working together on a treaty. 'Jointly' is more formal and implies shared responsibility, often seen in legal or business language ('the two companies jointly developed the software'). 'Cooperatively' emphasises the willingness to help each other and the absence of conflict. 'In partnership' suggests a structured, often official relationship between equals. 'In tandem' adds the idea of close, well-coordinated action — the parts move like the two wheels of a tandem bicycle, each supporting the other. For example: 'The design team and the engineering team worked in tandem to solve the problem' sounds more dynamic than 'worked together', because it implies their efforts were precisely synchronised.

in tandem ↗together ↗jointly ↗cooperatively ↗in partnership

Etymology

LatinEnglish

The word 'tandem' comes from Latin 'tandem' meaning 'at length' or 'at last'. In 18th-century England, it was adopted as a humorous Latin pun for a two-wheeled carriage pulled by horses harnessed one behind the other rather than side by side — a novel arrangement at the time. From this physical meaning of 'one behind the other', 'in tandem' later developed the metaphorical senses of 'working closely together' and 'happening at the same time'.