Pronunciation: (lach),[key] —n. 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.
—v.t. to close or fasten with a latch.
—v.i. 1. to close tightly so that the latch is secured: The door won't latch. 2. latch on, a. to grab or hold on, as to an object or idea, esp. tightly or tenaciously.
b. to include or add in; attach: If we latch the tax on, the bill will come to over $100. 3. latch onto,Informal. a. to take possession of; obtain; get.
b. to acquire understanding of; comprehend.
c. to attach oneself to; join in with: The stray dog latched onto the children and wouldn't go home.