(informal, transitive) To punch or hit. / (New Zealand, slang, transitive) To discard; to throw out; to throw away. / (informal, sports) To wipe out; to faceplant; to fall.

The sound of a person being punched or hit.

(pathology) A birth defect resulting in a cleft in the spinal column through which the spinal membranes and spinal cord may protrude. It is characterised by hydrocephalus and other neurological disorders.

A deep-red cooking apple native to Britain. / Such an apple baked and flattened as a snack, popular in Norfolk.

(archaeology) The roughly biconical remains of a piece of worked flint(1) from which all possible blades have been struck.

Having two faces or opposing surfaces. / (archaeology, of a flint tool) Having two sharp cutting edges.

(optics) Having two focal lengths / (of a correcting lens) Divided into two parts, one of which corrects for distance vision and the other for near vision

(mathematics) A branch of mathematics concerned with dynamical systems which suffer sudden qualitative changes from an infinitesimal change in a parameter.

(US) A toilet / (US) An outhouse

Cleft; divided into two lobes.