see, spot, tell, smell, etc. something a mile offidiomPart ofmilesee, spot, tell, smell, etc. something a mile offsee, spot, tell, smell, etc. something a mile off — idiomidiom1. This means to see or realize something very easily and quickly.1.idiomDefinitionThis means to see or realize something very easily and quickly.ExampleYou could see his lie a mile off because he was blushing.After years in sales, Maya can spot a fake smile a mile off.