(as) dull as dishwater

idiom

Definition of (as) dull as dishwater

US, informal
: very boring or dull The conversation was as dull as dishwater.

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“(as) dull as dishwater.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/%28as%29%20dull%20as%20dishwater. Accessed 5 Aug. 2020.

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