Meaning
A storm in a teacup / Making a mountain out of a molehill
Example
Não faça uma tempestade em copo d'água, ela só fez um comentário inocente.
Don't make a mountain out of a molehill, she only made an innocent comment.
Origin
The French form une tempête dans un verre d'eau appears in Montesquieu, who reportedly used it to describe political unrest in the Republic of San Marino. The same image exists in English as 'a storm in a teacup' from the early 19th century.
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More idioms
Acertar na moscaTo guess correctly / To hit the nail on the headAmigo da onçaA fake/false friendAndar na linhaTo toe the line / To behave properlyArmar um barracoTo cause a public sceneRodar a baianaTo cause a public scene / To go ballisticArrumar sarna pra se coçarTo ask for troubleArrastar as asasTo hit on someone / To flirtAbrir o jogoTo come clean / To open upArregaçar as mangasTo roll up one's sleeves / To get to workAgarrar com unhas e dentesTo hold on for dear life / To seize an opportunity