pour water on a duck's back

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pour water on a duck's back

To do or attempt something futile or useless. I know you dislike Reginald's new companion, but I doubt he'll listen if you lecture him. It would be like pouring water on a duck's back.
See also: back, on, pour, water
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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