halve

Short definition from Wiktionary

Verb

1. 1
   To reduce to half the original amount.
2. 2
   To divide into two halves.
3. 3
   To make up half of.
4. 4
   To join two pieces of timber etc. by cutting away each for half its thickness at the joining place, and fitting together.
5. 5
   In match play, to achieve a tie or draw on.