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dishwater

dishwater /ˈdɪʃˌwɑːtɚ/ noun
dishwater
/ˈdɪʃˌwɑːtɚ/
noun
Britannica Dictionary definition of DISHWATER
[noncount]
: water in which dishes have been or are going to be washed

(as) dull as dishwater

US, informal
: very boring or dull

like dishwater

informal
: having very little flavor used to describe soups or drinks