Spend a penny

Pro Tip 1/3

It's a casual way to excuse oneself for a toilet break, mainly used among friends or in relaxed settings, not formal occasions.

Can you hold my bag? I'll spend a penny and be right back.

Pro Tip 2/3

This phrase is uniquely British, so it might confuse English speakers from other countries where it's not commonly used.

When I said I needed to spend a penny, my American friend had no idea I meant using the restroom.

Pro Tip 3/3

Originally, it referred to inserting a penny into a public toilet lock; understanding this may help remember the phrase.

There's no need to spend a penny nowadays; the toilets at the station are free.