bulk up
verb
Definition of bulk up
intransitive verb
: to gain weight especially by becoming more muscular
transitive verb
: to cause to bulk up
Explore Merriam-Webster
Examples of bulk up in a Sentence
she bulked up her hair with one hand as she reached for the shears with the other
First Known Use of bulk up
1979
Learn More about bulk up
Seen and Heard
What made you want to look up bulk up? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!