Origin of latch

before 950; 1930–35 for def 5; Middle English lacchen, Old English lǣccan to take hold of, catch, seize; akin to Greek lázesthai to take

OTHER WORDS FROM latch

re·latch, verb (used with object)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for latch onto

latch
/ (lætʃ) /

noun

a fastening for a gate or door that consists of a bar that may be slid or lowered into a groove, hole, etc
a spring-loaded door lock that can be opened by a key from outside
Also called: latch circuit electronics a logic circuit that transfers the input states to the output states when signalled, the output thereafter remaining insensitive to changes in input status until signalled again

verb

to fasten, fit, or be fitted with or as if with a latch

Word Origin for latch

Old English læccan to seize, of Germanic origin; related to Greek lazesthai
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Idioms and Phrases with latch onto

latch onto

Also, latch on to.

1

Get hold of, grasp; also, understand, grasp mentally. For example, They latched onto a fortune in the fur trade, or Carol quickly latched on to how the sewing machine works. [c. 1930]

2

Attach oneself to, join in with, as in Rob didn't know the way so he latched on to one of the older children. [c. 1930]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.