1
: alternately in and out
he's been in and out all day
2
: to the last detail : exhaustively, thoroughly
understands his business in and out knew each other in and out—Virginia Woolf
: an obstacle found in fox hunting and steeplechasing consisting of two fences in close proximity but impossible to clear in the same jump
1
: now good and now bad in performance
an in-and-out showing—Williams Alumni Review
2
: characterized by purchase and sale of the same security within a short period
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Merriam-Webster unabridged
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