(Australia, attributive) A tax avoidance scheme from the 1970s.

(childish, vulgar) A fart.

Alternative spelling of sulfur-bottom

the blue whale

Lowest, closest to the bottom.

plural of bottom gear

The lowest gearing available from a gearbox, typically in a motor vehicle or cycle.

Alternative spelling of rock bottom

(intransitive, figuratively) To fall to the lowest possible level.

(of a fish or other aquatic creature) Feeding off plant and animal life found in the lowest regions of its habitat.