a device for holding a door, gate, or the like, closed, consisting basically of a bar falling or sliding into a catch, groove, hole, etc.

to close or fasten with a latch.

to close tightly so that the latch is secured

The door won't latch.

latch on,

to grab or hold on, as to an object or idea, esp. tightly or tenaciously.

to include or add in; attach

If we latch the tax on, the bill will come to over

latch onto, Informal .

to take possession of; obtain; get.

to acquire understanding of; comprehend.

to attach oneself to; join in with

The stray dog latched onto the children and wouldn't go home.

noun

key

verb

loose , loosen , unfasten , unlatch , unlock

noun

bar , bolt , catch , clamp , fastening , hasp , hook , padlock

verb

bar , bolt , cinch , close , close up , lock , make fast , secure , button , catch , clamp , fasten , fastener , hook