1. 抓住：latania 拉塔尼亚芭蕉 | latch on 抓住 | latch 门插销

2. 扣上：latch mechanism 锁紧机构 | latch on 扣上 | latch plate 插销板

3. [口]缠住不放：9.nipple n.乳头,橡皮奶头 | 10.latch on[口]缠住不放 | 11.furiously adv.强烈地,使劲地

4. 缠住不放：9.nipple n.乳头,橡皮奶头 | 10.latch on缠住不放 | 11.furiously adv.强烈地,使劲地

verb

1. understand, usually after some initial difficulty

e.g. She didn't know what her classmates were plotting but finally caught on

Synonym: catch onget wiseget ontotumblecotton ontwigget it

2. adopt

e.g. take up new ideas

Synonym: take upfasten onhook onseize on

3. take hold of or attach to

e.g. The biochip latches onto the genes