clearance : Idioms & Phrases
clearance sale
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noun a sale to reduce inventory
clearance sale.
WordNet
Clearance space
(Steam engine) , the space inclosed in one end of the cylinder, between the valve or valves and the piston, at the beginning of a stroke; waste room. It includes the space caused by the piston's clearance and the space in ports, passageways, etc. Its volume is often expressed as a certain proportion of the volume swept by the piston in a single stroke.
Webster 1913
inventory-clearance sale
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noun a sale to reduce inventory
clearance sale.