bone up on

IPA/bˈəʊn ˌʌp ˈɒn/
IPA/bˈoʊn ˌʌp ˈɔn/

bone up on — phrasal verb

  • bone up onbase form
  • bones up on3rd person singular
  • boning up on-ing form
  • boned up onpast simple

1. to study or review a subject with focused effort, usually because you will soon

1.phrasal verbtransitiveB2
Definition

to study or review a subject with focused effort, usually because you will soon need the knowledge for something specific

Example

Lisa boned up on Italian history before her trip to Rome.

The sales team boned up on the product specs because the launch was just days away.

bone up on + topic + because + reason

Common collocations
  • bone up on a subject
  • bone up on a topic
Synonyms
  • brush up on

    milder; implies refreshing knowledge you already have rather than learning from scratch

  • cram

    more urgent and last-minute; strongly associated with exam preparation; does not require 'on'

  • swot up on

    informal British equivalent; rarely used in American English

Grammar Patterns

bone up on + noun phrase

Usage Note

Always followed by 'on' and a noun or noun phrase naming the subject being studied. The object cannot be a person — you bone up on a topic, not on someone.

Common Mistakes

I need to bone up my French before the trip.
I need to bone up on my French before the trip.
the preposition 'on' is required; you always bone up ON something.

Synonym discussion

Sense: phrasal verb/1

Bone up on, brush up on, cram, and swot up on all refer to intensive study or review, but they differ in urgency and register. Bone up on suggests focused preparation for a specific upcoming need — a job interview, a meeting, or a trip — and is neutral in register. Brush up on is milder: it implies refreshing existing knowledge rather than learning from scratch. Cram carries a stronger sense of last-minute urgency and is closely tied to exam preparation; it does not require 'on.' Swot up on is the informal British equivalent of bone up on, rarely heard in American English. For example, you might brush up on your French before a holiday, bone up on company history before a job interview, cram for a biology exam the night before, or swot up on local laws before moving to the UK.

brush up on ↗cram ↗swot up on ↗

Etymology

English

Originated in 19th-century American college slang. The verb 'bone' was used to mean 'study hard,' probably from the image of a dog gnawing a bone to extract every last scrap — students 'boned' their textbooks the same way.