弛み
たるみ · tarumi · JLPT N1 · noun
slack
🏹 弛 = 弓 (bow radical) + 也 (sound): a bowstring left unstrung goes slack, hence たるみ
The bow radical 弓 gives the sense: a bowstring that loosens goes slack. 也 supplies the sound. The verb form 弛む (tarumu) means to slacken or sag.