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general::
Phrase(s): a tempest in a teacup [and] a tempest in a teapot
an argument or disagreement over a very minor matter. • The entire issue of who was to present the report was just a tempest in a teapot. • The argument at the office turned into a tempest in a teacup. No one really cared about the outcome.
McGrawhill's American Idioms And Phrasal Verbs