Bottom-woman

Slang. bottom lady.
a pimp’s most reliable prostitute.
a female pimp.
the madam of a brothel.

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Bottom-yeast
a yeast whose cells, in the manufacture of wine and lager beer, fall to the bottom as a sediment.
Bottom-dwelling
adjective
Bottomfishing
to fish with a weighted line for fish that feed close to the bottom. the activities of a bottom feeder.