sourd comme un pot

Literally, “deaf as a post”, pot being an old word for "post" (Modern French poteau).

• IPA^(key): /suʁ kɔ.m‿œ̃ po/

• Audio (France (Somain)):

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sourd comme un pot (feminine sourde comme un pot, masculine plural sourds comme des pots, feminine plural sourdes comme des pots)

1. (simile) stone deaf, deaf as a doorpost, deaf as a post