Noun
A double-barreled shotgun (or infrequently a rifle), with one barrel placed on top of the other.
Synonyms: over-under, under and over
An obstacle in obstacle-course racing composed of multiple bars, with bars set at various heights, where the competitor must pass over high bars and pass under low bars.
(slang) Synonym of speedball (“type of illicit drug”)
over-and-under (plural over-and-unders)
Alternative form of over and under
over-and-under