Origin of squint

1350–1400 for earlier adv. sense; 1570–80 for adj. senses; Middle English; aphetic variant of asquint
Related formssquint·er, nounsquint·ing·ly, adverbsquint·ing·ness, nounun·squint·ing, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for unsquinting

squint

verb

(usually intr) to cross or partly close (the eyes)
(intr) to have a squint
(intr) to look or glance sideways or askance

noun

the nontechnical name for strabismus
the act or an instance of squinting; glimpse
Also called: hagioscope a narrow oblique opening in a wall or pillar of a church to permit a view of the main altar from a side aisle or transept
informal a quick look; glance

adjective

having a squint
informal crooked; askew
Derived Formssquinter, nounsquinty, adjective

Word Origin for squint

C14: short for asquint
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 unsquinting

squint

adj.

1560s, shortened form of asquint (q.v.). The verb is attested from 1590s; the noun from 1650s. Related: Squinted; squinting.

Online Etymology Dictionary, © 2010 Douglas Harper

unsquinting in Medicine

squint

[skwĭnt]

n.

strabismus
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.