Meaning of LATCH in English

LATCH

■ noun

1》 a bar with a catch and lever used for fastening a door or gate.

2》 a spring lock for an outer door, which catches when the door is closed and can only be opened from the outside with a key.

3》 Electronics a circuit which retains whatever output state results from a momentary input signal until reset by another signal.

■ verb

1》 fasten with a ~.

2》 Electronics (of a device) become fixed in a particular state.

3》 ( ~ on ) informal understand the meaning of something.

4》 ( ~ on to ) informal attach oneself to (someone) as a constant companion.

↘take up (an idea or trend) enthusiastically.

5》 ( ~ on ) (of a breastfeeding baby) manage to get its mouth into the correct position around the nipple.

Phrases

on the ~ chiefly Brit. (of a door or gate) closed but not locked.

Origin

OE læccan 'take hold of, grasp', of Gmc origin.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.