The difference between Spit the dummy and Throw a tantrum
When used as verbs, spit the dummy means to overreact (as an adult) to a situation, in an angry and childish manner, whereas throw a tantrum means to have a temper tantrum.
check bellow for the other definitions of Spit the dummy and Throw a tantrum
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Spit the dummy as a verb (idiomatic):
To overreact (as an adult) to a situation, in an angry and childish manner.
Examples:
"He'll really spit the dummy when he hears that he's not going on that trip."
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Throw a tantrum as a verb (idiomatic):
To have a temper tantrum; to display a fit of childish anger.