in for a penny, in for a pound UK /ɪn fəɹə ˈpɛ.ni ɪn fəɹə paʊnd/US /ɪn fɔɹ ə ˈpɛ.ni ɪn fɔɹ ə paʊnd/ saying1 •(UK) Expressing that, having begun something (that involves significant risk or effort), one intends to see it to completion rather than stopping short.Having tripped the bank's alarms, he simply uttered: "in for a penny, in for a pound", and continued on.
