IdiomDaily LifeFrench

Enfoncer une porte ouverte

Meaning: To make a great effort to establish something nobody disputes.

Literally: To break down an open door

Example: “Une étude à cent mille euros pour prouver que les enfants aiment les vacances : on enfonce une porte ouverte.” — A hundred-thousand-euro study to prove that kids like vacations is reinventing the wheel.

English equivalent: To reinvent the wheel

Equivalents in other languages

Origin: The force is entirely wasted because the obstacle was not there. It is the standard French rebuke to an argument that has won nothing.

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