(of a door or gate) closed but not locked
（门）关着但没锁上
let yourself in, the door's on the latch.
你进来吧，门没锁。
(of a breastfeeding baby) manage to get its mouth into the correct position around the nipple
（哺乳婴儿）用嘴叼到乳头
attach oneself to (someone) as a constant and usually unwelcome companion
纠缠
he spent the whole evening trying to latch on to my friends.
他整个晚上都纠缠着我的朋友。
understand the meaning of (something)
理解，明白
[with clause]she'll soon latch on to what is happening.
她很快就会理解发生了什么。
To get hold of; obtain
取得；得到
latched on to a fortune in the fur trade.
在皮毛生意中赚了一大笔钱