bulk up ( bulking, bulked, bulks )

• 1. 

  PHRASAL VERB If someone bulks up or if they bulk up their body, they put on weight in the form of extra muscle. 使变粗壮; 变粗壮

  例：

  They feel I need to bulk up, and to improve my upper body strength.

  他们觉得我需要变粗壮些，并增强上身的力量。

  例：

  My friend is obsessed with going to the gym and has really bulked up her arms.

  我朋友迷上了去健身房，她确实把胳膊练得粗壮了。