相あい半なかばする

suru verb (special), intransitive verb

be roughly equal; balance out; cancel each other out

Used when two opposing forces, numbers, or qualities are approximately equal, so that neither side dominates. Often appears in formal or written contexts.

• 賛さん成せいと反はん対たいの意い見けんが相あい半なかばして、結けつ論ろんが出でなかった。

  Opinions for and against were roughly equal, so no conclusion was reached.

• 両りょうチームの実じつ力りょくは相あい半なかばしている。

  The abilities of the two teams are about evenly matched.