flex
/fleks; flɛks/ n
(esp Brit) (US cord) [C, U]
(length of) flexible insulated wire used for carrying an electric current to an appliance 花线; 皮线.
flex / fleks; flɛks/ v
1 [Tn] bend or move (a limb, joint or muscle), esp in order to exercise one's body before an activity 弯曲或活动（四肢、 关节或肌肉）（尤指准备活动）
flex one's knee, toes, muscles, etc 曲膝、 活动脚趾、 活动肌肉.
2 (idm 习语) flex one's `muscles show one's strength and power, esp as a warning or to display pride in oneself 显示力量（尤指表示警告或自豪）.