over and under

See also: over-and-under

English

Noun

over and under (plural over and unders)

1. A double-barreled shotgun (or infrequently a rifle), with one barrel placed on top of the other.

   Synonyms: over-under, under and over

2. 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.
3. (slang) Synonym of speedball (“type of illicit drug”)