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(countable) A backward kick; a retrograde movement of an extremity.
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(countable, informal) A covert, often illegal, payment in return for a favor consisting of providing an opportunity of chargeable transaction; especially, a kind of quid pro quo in which if you (an insider) secretly help me (an outsider) win the bid for the contract then I will secretly send you a portion of the contract value; thus, a kind of bribe.
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(uncountable, firearms, machinery) Recoil; a sudden backward motion, usually in the direction of the operator.
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(countable, machinery) An accident where an object being cut by a rotating blade or disk, such as a circular saw, is caught by the blade and thrown outward.
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(machinery, forestry) An accident wherein the upper tip of the bar of a running chainsaw contacts a relatively immovable object, forcing the bar upwards and pressing the running chain more firmly against the object, causing the saw to be hurled upwards and backwards into the operator's face.
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(oil industry) A dangerous buildup of gas pressure at the wellhead.
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(countable, bowling) The board separating one bowling lane from another at the pit end.
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(uncountable, bridge) In contract bridge, an ace asking convention initiated by the first step above four of the agreed trump suit.
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(pinball) A feature that saves the ball from draining and propels it back into play.
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A relaxed party.