halve

verb5

1. •
   To divide into two halves.
2. •
   To reduce to half the original amount.

   • These show that since 1946 the fatality rate in train and movement accidents combined has been halved, [...]. — 1960
3. •
   In match play, to achieve a tie or draw on.

   • All that counts is whether you won, lost, or halved the match. — 2005
4. •
   To join two pieces of timber etc. by cutting away each for half its thickness at the joining place, and fitting together.
5. •
   To make up half of.

   • So far apart their lives are thrown / From the twin soul that halves their own. — 1855