wouldn't know if it hit in the face

(redirected from wouldn't know if fell over one)

wouldn't know something if it hit you in the face

  also wouldn't know something if you fell over one
to not notice something although it is very obvious Julie wouldn't know a good deal if it hit her in the face!
See can't tell arse from elbow, know the half of it, know by heart, know the ropes
See also: face, hit, if, know
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