To act in an inept, clumsy or inexpert manner; to make mistakes.

(programming) An exception (error condition) when handled by a debugger, such that the programmer has the first chance to study it; such an exception would otherwise proceed to a handler or (in its...

(law) Abbreviation of Kosovo.

(nautical) To take in part of a sail in order to adapt the size of the sail to the force of the wind. / (Australia) To pull or yank strongly, especially in relation to horse riding.