intensify:

vi. 增强，强化；变激烈

vt. 使加强，使强化；使变激烈

The anti-corruption bureau intensified the strength of striking illegal activities.

反贪局加大了打击非法活动的力度。

tighten:

vt. 变紧；使变紧

vi. 绷紧；变紧

The athlete tightened his shoelaces before running.

运动员跑步前把鞋带系紧。