flex.
美 [fleks] 
英 [fleks] 
- abbr.(=flexible)
 - 网络屈曲活动;铜箔基材;弯曲
 
Flex.
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1.  | [t][i] ~ (sth) 屈伸,活动(四肢或肌肉,尤指为准备体力活动)to bend, move or stretch an arm or a leg, or contract a muscle, especially in order to prepare for a physical activity  | 
to flex your fingers/feet/legs 活动手指╱双脚╱双腿  | |
He stood on the side of the pool flexing his muscles. 他站在游泳池旁活动肌肉。  | 
IDM
flex your muscles
显示实力,炫耀力量(尤指作为警告或威胁)to show sb how powerful you are, especially as a warning or threat