know at a glance that

know at a glance that (something is the case)

To understand or realize very quickly that something is the case, without the need for much evidence or careful consideration. The mechanic knew at a glance that the engine was beyond repair. My dad knew at a glance that we were lying about what happened.
See also: glance, know, that
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

know at a glance that...

to know [something] without much evidence; to know or understand something without a lot of observation. I knew at a glance that Bobbie was severely injured and had to be gotten to a hospital as soon as possible.
See also: glance, know, that
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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