1670s, from un- (2) "reverse, opposite of" + leash (v.). Related: Unleashed; unleashing.

1540s, from un- (2) "reverse, opposite of" + tangle (v.). Related: Untangled; untangling.

1775, from un- (2) "reverse, opposite of" + tether (v.). Related: Untethered; untethering.

1775, from un- (2) "reverse, opposite of" + plug (v.). Related: Unplugged; unplugging.

"backside foremost," 1530s, probably a reduplication of arse, perhaps with suggestions of reverse.

1836, from un- (2) "reverse, opposite of" + stack (v.). Related: Unstacked; unstacking.

1580s, intransitive; 1590s, transitive," from un- (2) "reverse, opposite of" + curl (v.).

1706, from un- (2) "reverse, opposite of" + stick (v.). Related: Unsticking.

late 14c., from un- (2) "reverse of" + buckle (v.1). Related: Unbuckled; unbuckling.

1560s, from un- (2) "reverse, opposite of" + cap (v.). Related: Uncapped; uncapping.