godan verb (-su), transitive verb
fail to hear; miss hearing
Used when someone unintentionally does not catch something said, often due to inattention or noise. Similar to 聞き漏らす, but 聞き落とす emphasizes the act of missing rather than letting something slip.
See also: 聞き漏らす (ききもらす)
大事なところを聞き落としてしまった。
I missed an important part of what was said.
うるさくて、
It was so noisy that I failed to hear his words.