Definitions from Wiktionary (know which way is up)
▸ verb: Alternative form of know which end is up [(idiomatic) To possess sound judgment or common sense; to have a clear understanding of a situation.]
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▸ verb: Alternative form of know which end is up [(idiomatic) To possess sound judgment or common sense; to have a clear understanding of a situation.]
Similar:
not know where to turn,
know inside out,
know one's own head,
know like the palm of one's hand,
know if one is Arthur or Martha,
know a B from a battledore,
have got a point,
one-up,
catch wind of,
cap it off,
more...
▸ Words similar to know which way is up
▸ Usage examples for know which way is up
▸ Idioms related to know which way is up
▸ Wikipedia articles (New!)
▸ Words that often appear near know which way is up
▸ Rhymes of know which way is up
▸ Invented words related to know which way is up