sound leakage; sound leaking out
Refers to sound escaping from headphones, earphones, or other audio devices, often a concern in public places.
電車の中で音漏れがひどい人がいた。
There was a person on the train whose sound leakage was really bad.
このヘッドホン
These headphones have very little sound leakage.
Compound of 音 (sound) and 漏れ (leaking), from the verb 漏れる (to leak).