upside
2up·side
prep \ˈəp-ˈsīd\Definition of UPSIDE
: up on or against the side of <layin' in this death cell, writin' my time upside the wall — Lonnie Johnson> <smacked him upside the head>
See Origin of UPSIDE
perhaps from 1up + -side (as in alongside)
First Known Use: 1929
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