Definition of (like) water off a duck's back
informal
: having no effect on someone
He tried to convince her to take the job, but his advice was like water off a duck's back.
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“(like) water off a duck's back.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/%28like%29%20water%20off%20a%20duck%27s%20back. Accessed 22 Jun. 2021.
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