Backfist
a karate punch with the back of a clenched hand.
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- Backfit
to update by providing new or improved equipment or features: a five-year program of installing new power plants and backfitting existing ones.
- Backflap hinge
building trades. flap (def 20a).
- Back float
a floating position on one’s back with arms extended out to the sides and face upward.
- Backflow
a flow of a liquid opposite to the usual or desired direction.
- Backflow valve
backwater valve. a valve for preventing flowing liquid, as sewage, from reversing its direction.