bulk up

• IPA^(key): /ˌbʌlk ˈʌp/

• Audio (US)

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bulk up (third-person singular simple present bulks up, present participle bulking up, simple past and past participle bulked up)

1. (intransitive) To gain weight.
2. (transitive) To increase the weight of.
3. (bodybuilding) To train the body with a high-calorie diet and intense weightlifting in order to increase the overall mass of the body, especially the muscles.
   • 2017 January 9, Hurford, Molly, “Cross-Training Workouts Every Runner Should Try”, in MapMyRun‎:

     A review of studies done on runners and strength training showed generally positive impacts and no negative consequences. You won’t hulk out or bulk up just fine-tune some lean muscle in ways that running alone can’t do.

• (gain weight):
• (increase the weight of):
• (increase muscle mass): hulk out