tauten

当他站起身时，他感到肩膀上的肌肉绷紧了。

As he stood up, he felt the muscles in his shoulders ___tauten.

风渐起，船帆在桅杆上绷得更紧了。

As the wind picked up, the sails began to ___tauten against the mast.

随着对手逼近，她的面部表情绷紧了。

Her facial expression began to ___tauten as her opponent approached.