halve

Concise Oxford English Dictionary © 2008 Oxford University Press:
halve/hɑːv/

▶verb

• 1 divide into two parts of equal size.

  ■ share (something) equally with another person.

• 2 reduce or be reduced by half.

• 3 Golf use the same number of strokes as an opponent and thus draw (a hole or match).

• 4 (usu. as noun halving) fit (crossing timbers) together by cutting out half the thickness of each.

– origin ME: from half.