kick-off : the begining of something 事物的开始

Candidates kick off their campaigns with a speech. 候选人常以演讲的形式开始他们的竞选

Students kick-off the semester with a party! 学生们在开学之初举办了一个派对

up someone's sleeve:someone's secret 某人的秘密

People dislike those who often have something up their sleeve. 人们不太喜欢那种什么事都要保密的人

The wife has something up her sleeve for her husband's birthday party。这个妻子秘密的为她丈夫举办了生日聚会