spend a penny
US /spɛnd ə ˈpɛni/
UK /spɛnd ə ˈpɛni/

1.
上廁所, 去洗手間
(British, informal, euphemistic) to use a toilet
:
•
Excuse me for a moment, I just need to spend a penny.
抱歉,我需要去洗手間。
•
After the long journey, everyone was desperate to spend a penny.
長途旅行後,每個人都急著去洗手間。