stepsthup
—phrasal verbwithstepverb[I+ adv/prep]uk/step/us/step/-pp-
toincreasethesize,amount, orspeedof aprocessthat isintendedtoachievesomething
增加（尺寸或数量）；加快（进程）的速度
Thepolicearesteppinguptheireffortstofightcrime.警方正在加大打击犯罪活动的力度。
Security has beensteppedup at theairport.机场加强了安全措施。