English Reference

Phrasal verb

bulk up

Definition

phr.v. to make your body bigger and stronger by lifting weights and eating more food.

phr.v. to increase one's body mass, specifically muscle tissue, through a combination of hypertrophy-focused resistance training and a caloric surplus.

Examples

“He wants to bulk up before the rugby season starts.”

“After months of lifting heavy weights and eating extra protein, the athlete managed to bulk up significantly.”

“The actor was required to bulk up for his role as a superhero, undergoing a rigorous six-month physical transformation under professional supervision.”

Examples

simple

“He wants to bulk up before the rugby season starts.”

contextual

“After months of lifting heavy weights and eating extra protein, the athlete managed to bulk up significantly.”

complex

“The actor was required to bulk up for his role as a superhero, undergoing a rigorous six-month physical transformation under professional supervision.”

Usage

Intransitive when referring to a person's physical growth.

Teaching tip

contrast with 'slim down' or 'tone up'; 'bulk' implies a significant increase in size and volume rather than just definition.

Synonyms

build muscleget big

Antonyms

slim downlean out

Phrasal verb

Particles

up

Separability

optional

Pattern

bulk + up (+ object)

Synonyms

get bigbuild musclegain weight

Antonyms

slim downlose weight

Grammar

This entry

Level
B2 · Upper Intermediate
Updated
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Informal

Scan code

englishreference.com/q/bulk-up

English Reference