aggressor

IPA/əˈɡresə(r)/
KK[əɡrˈɛsɚ]IPA/əˈɡresər/

aggressor — noun

  • aggressorsingular
  • aggressorsplural

1. The person, country, or group that starts a fight, argument, or war by being the

1.nounB2
Definition

The person, country, or group that starts a fight, argument, or war by being the first to attack — for example, a nation that sends troops across a border, or someone who throws the first punch.

Example

Police arrested the aggressor after watching the fight on video.

The UN report named the neighboring country as the aggressor in the conflict.

named [someone/something] as the aggressor — formal identification

Common collocations
  • the aggressor in [a conflict/war/fight/argument]
  • name/identify/call someone the aggressor
  • act as the aggressor
  • label someone the aggressor
Synonyms
  • attacker

    More general — an attacker may fight back rather than start the conflict

  • assailant

    Formal, typically used for a physical assault in a legal context

  • invader

    Limited to military or territorial contexts; implies entering another's land

Antonyms
  • defender

    The person or group that protects itself from an aggressor's attack

  • victim

    The person who suffers from the aggressor's actions

Grammar Patterns

be the aggressor in [conflict/argument/war]

name/identify [someone] as the aggressor

the aggressor in [situation]

Usage Note

Common in legal, political, and military contexts to identify the party that initiated a specific conflict. The opposite party is called the victim or the defender.

Common Mistakes

The man who attacked the police was the attacker.
The man who attacked the police was the aggressor.
'Attacker' focuses on the act of attacking; 'aggressor' emphasises that this person started the confrontation.

2. A person who regularly acts in a pushy, confrontational way that puts others on

2.nounC1
Definition

A person who regularly acts in a pushy, confrontational way that puts others on the defensive — for example, a colleague who interrupts and overrules others in meetings, or a relative who turns casual conversation into an argument.

Example

In team meetings, Lukas was often the aggressor who started heated debates.

be the aggressor who [verb] — relative clause describing behaviour pattern

The school counselor described the boy as an aggressor toward quieter children.

described [someone] as an aggressor toward [group]

Common collocations
  • be the aggressor in [a situation/relationship/meeting]
  • always/often the aggressor
  • see/describe someone as (an) aggressor
  • play the aggressor
Synonyms
  • instigator

    Focuses on starting trouble, but may be subtler and less physically aggressive

  • bully

    Emphasises intimidating weaker people; more negative and personal than aggressor

  • provocateur

    Formal; implies deliberate, often clever provocation rather than sheer forcefulness

Antonyms
  • peacemaker

    Someone who tries to stop conflicts rather than start them

  • mediator

    A neutral person who helps others resolve a disagreement

Grammar Patterns

be (always/often) the aggressor

see/describe [someone] as an aggressor

the aggressor in [situation/relationship]

Usage Note

Describes a habitual personality pattern rather than a single aggressive act. Often appears with frequency adverbs like always, often, usually.

Common Mistakes

He is an aggressor person.
He is an aggressor.
'Aggressor' is a noun, not an adjective; do not add 'person' after it.

Word family

Synonym discussion

Sense: noun/1

Aggressor, attacker, assailant, and invader all describe someone who causes harm, but they differ in scope and context. Aggressor carries a legal or historical weight — it specifically identifies the party that started a conflict (the nation that crosses a border first, the person who throws the first punch). Attacker is the broadest term, covering anyone who launches a physical or verbal assault, whether or not they initiated the overall situation. Assailant is formal and almost exclusively used in legal or crime reporting for a person who physically assaults someone. Invader is narrower still — limited to military or territorial contexts and implies entering another nation's or property's space. For example, a historian might call Germany the aggressor in 1914, a police report might name the assailant in a street robbery, and a news headline might call the army that crossed the border an invader.

attacker ↗assailant ↗invader ↗aggressor ↗

Common collocations

Nouns

Phrases

  • be the aggressor
  • act as the aggressor
  • label someone the aggressor
  • name/identify someone as the aggressor
  • see/describe someone as an aggressor

Prepositions

  • in [conflict/war/fight/argument/situation/meeting]

Etymology

LatinEnglish

Aggressor comes directly from Latin 'aggressor', meaning 'attacker', built from 'aggredī' (to approach, to attack). 'Aggredī' itself is a combination of 'ad-' (toward) and 'gradī' (to step, to walk), so the original picture is of someone stepping toward another person with hostile intent. English borrowed the word in the late 1500s, initially in legal and military writing.