Like water off a duck's back
/laɪk ˈwɔːtər ɒf ə dʌks bæk/informalUK · US
What does “Like water off a duck's back” mean?
Like water off a duck's back means without upsetting or affecting someone, especially when criticism is involved
Some people stay calm when others criticise them. The remarks seem to slide away without changing their mood.
That can suggest admirable confidence, but not always. If useful advice is also like water off a duck's back, the person may simply refuse to listen.
When do people say it?
Use it for criticism, insults or unwanted advice that someone does not take to heart.
“The rude comments were like water off a duck's back to her.”
Is it formal or informal?
Register: informal. It is most at home in everyday conversation rather than formal writing. Most common in UK and US.
Where does it come from?
Water rolls off a duck's feathers. The saying uses that image for words that do not seem to leave a mark.
Origin confidence: Disputed; treat with caution
How do you say “Like water off a duck's back” in other languages?
Last updated 2026-09-19