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latch

[lach]
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noun
  1. 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.
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verb (used with object)
  1. to close or fasten with a latch.
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verb (used without object)
  1. to close tightly so that the latch is secured: The door won't latch.
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Verb Phrases
  1. latch on,
    1. to grab or hold on, as to an object or idea, especially tightly or tenaciously.
    2. to include or add in; attach: If we latch the tax on, the bill will come to over $100.
  2. latch onto, Informal.
    1. to take possession of; obtain; get.
    2. to acquire understanding of; comprehend.
    3. to attach oneself to; join in with: The stray dog latched onto the children and wouldn't go home.
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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
Related formsre·latch, verb (used with object)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

play, engage, perform, share, cooperate, compete, aid, appreciate, perceive, accept, fathom, comprehend, realize, partake, concur, strive, get, apprehend, make, dig
British Dictionary definitions for latch on

latch on

verb (intr, adverb often foll by to) informal
  1. to attach oneself (to)to latch on to a new acquaintance
  2. to understandhe suddenly latched on to what they were up to
  3. US and Canadian to obtain; get
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latch

noun
  1. a fastening for a gate or door that consists of a bar that may be slid or lowered into a groove, hole, etc
  2. a spring-loaded door lock that can be opened by a key from outside
  3. 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
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verb
  1. to fasten, fit, or be fitted with or as if with a latch
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Word Origin

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

Word Origin and History for latch on

latch

v.

Old English læccan "to grasp or seize," from Proto-Germanic *lakkijanan. Not found in other Germanic languages; probably from PIE *(s)lagw- "to seize" (see analemma). In its original sense the verb was paralleled in Middle English and then replaced by French import catch (v.). Meaning "to fasten with a latch" is mid-15c. Related: Latched; latching.

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latch

n.

a fastening for a door, etc., late 13c., probably from latch (v.).

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Online Etymology Dictionary, © 2010 Douglas Harper