乗のりかかった船ふね

expression

in for a penny, in for a pound; having gone too far to turn back

Idiomatic expression used when one is already committed to a course of action and might as well see it through, even if it becomes difficult. Literally 'a ship one has already boarded'.

• もうここまで来きたら乗のりかかった船ふねだ。