(curling) A shot in which the player curls the stone in the opposite direction in which the stone is expected to curve, due to significant defects in flatness of the ice surface

(medicine, of a bacterium) that is not stained violet by Gram's method

(rhetoric, usually derogatory) A phrase including two negative words (no, not, never, etc.) especially when used as intensifiers in informal English.

(film) A person whose profession is negative cutting and cuts and matches motion picture negatives using film splicers and film cement.

(finance) A type of loan or loan condition in which the borrower agrees with the lender not to allow any other lender or creditor to rank ahead for payment in the event of a liquidation. Such a loan is unsecured (ie. not backed by a charge over specific assets).

(derogatory, informal) A person who is considered excessively and disagreeably pessimistic.

plural of double negative

A fallacious judgment that, because a premise cannot be proven true, that premise must be false.

Pressure that is less than normal atmospheric pressure

The removal of a discouraging stimulus associated with a particular behaviour with the result that it is more likely to be repeated.