- incompletely or partially: to do things by halves.
- halfheartedly: better not at all than by halves.
Also, go fifty-fifty. Share equally. For example, Ann suggested that they go halves on the rent, or The brothers are going fifty-fifty in their new business. The first term dates from the late 1600s, the variant from the early 1900s.
see by halves; go halves. Also see under half.