with obj.
1- bend (a limb or joint)弯曲, 屈曲（四肢, 关节）：
she saw him flex his ankle and wince.
她看见他弯起脚踝满脸痛苦。
1.1
- no obj.(of a limb or joint) become bent（四肢, 关节）弯曲：
prevent the damaged wrist from flexing.
别让伤腕弯曲。
1.2
- cause (a muscle) to stand out by contracting or tensing it绷紧（肌肉）使之突起：
bodybuilders flexing their muscles.
绷紧肌肉的健美运动员。
1.3
- no obj.(of a muscle) contract or be tensed（肌肉）收缩, 绷紧：
a muscle flexed in his jaw.
他颚部一块肌肉绷紧了。
1.4
- no obj.(of a material) be capable of warping or bending and then reverting to shape（材料）有弹性：
set windows in rubber so they flex during an earthquake.
将窗户用橡皮箍紧, 地震时可有挠度。
1.5
- usu. as adj. flexed Archaeology place (a corpse) with the legs drawn up under the chin【考古】屈肢安放（尸体）：
a flexed burial.
屈肢葬。
短语
flex one's muscles
- 见MUSCLE.
词源
early 16th cent.: from Latin flex- 'bent', from the verb flectere.