invert (v.) Look up invert at Dictionary.com
"to turn (something) in an opposite direction; reverse the position, order, or sequence of," 1530s, from Middle French invertir or directly from Latin invertere "turn upside down, turn about; upset, reverse, transpose," figuratively "pervert, corrupt, misrepresent," of words, "to use ironically," from in- "in, on" (from PIE root *en "in") + vertere "to turn" (from PIE root *wer- (2) "to turn, bend"). Related: Inverted; inverting; invertedly.