bête à manger du foin

== French == === Etymology === Literally, “(so) dumb as to eat hay”. A pun on bête, which means both "dumb" and "beast". === Pronunciation === IPA(key): /bɛt a mɑ̃.ʒe dy fwɛ̃/ === Adjective === bête à manger du foin (plural bêtes à manger du foin) (simile) Very stupid; dumb as a rock; dumb as a doorknob Synonyms: bête comme ses pieds, con comme un balai, con comme la lune