loss of tempo
Used in shogi and othello to describe a move that wastes a turn or loses initiative.
その手は手損になるので、別の手を指したほうがいい。
That move would be a loss of tempo, so you should play a different move.
Compound of 手 (move, hand) and 損 (loss, disadvantage). The exact derivation is uncertain, but it is a technical term in board games.