setsthoff
—phrasal verbwithsetverbuk/set/us/set/present participlesetting|past tense and past participleset
(CAUSE)
C2
tocauseanactivityorevent, often aseriesofevents, tobeginorhappen
引起，引发（常指一系列事件）
The court'sinitialverdictin thepoliceofficers'trialset offseriousriots.法庭审理这起警官案件作出的初审判决引起了严重的暴乱。
C2
tocausealoudnoiseorexplosion, such as that made by abombor analarm(= awarningsound)tobeginorhappen
使发出巨响；使爆炸，引爆
Terrorists set off abombin thecitycentre.恐怖分子在市中心引爆了一颗炸弹。
Somebody set thealarmoff on mycar.有人触发了我车上的报警器。
(MAKE NOTICEABLE)
to make somethinglookattractivebyprovidingacontrast(=attractivedifference)to it
（通过对比）使更有吸引力；衬托
The newyellowcushionsnicelyset off thepalegreenof thechaircovers.黄色的新靠垫把浅绿色的椅套衬托得很好看。