flex

v. 弯曲,伸缩,褶曲
n. 电线,松紧带

Capable of being bent or flexed; pliable.

柔软的可弯曲或扭曲的；柔韧的

The gardeners flexed their muscles and began to dig.

园丁们舒腰展臂后才开始挖地。