try square

WordReference Random House Unabridged Dictionary of American English © 2026

try′ square′, 

1. Building a device for testing the squareness of carpentry work or the like, or for laying out right angles, consisting of a pair of straightedges fixed at right angles to one another.

• 1875–80

Collins Concise English Dictionary © HarperCollins Publishers::

try square noun

1. a device for testing or laying out right angles, usually consisting of a metal blade fixed at right angles to a wooden handle