This is the 7747th most frequent Japanese word.
口ひげ
Mustache.
In this sentence, 『口ひげ』 refers to the mustache that is being actively groomed or shaved.
口ひげを剃るのに時間がかかりました。
It took time to shave the mustache.
Here, 『口ひげ』 is used to describe facial hair on the upper lip, specifically focusing on its appearance.
彼の口ひげはとても立派ですね。
His mustache is very impressive.
『口ひげ』 is used to hypothetically suggest that having a mustache could change one's appearance or impression.