beadja a derekát

bead (“to hand in”) +‎ -ja (personal suffix) +‎ a (“the”) +‎ derék (“waist”) +‎ -a (“his/her/its”, possessive suffix) +‎ -t (accusative suffix), literally “to hand in one's waist”

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beadja a derekát

1. (idiomatic) to give in, to cave in, to knuckle under (to relent or yield under pressure to somebody else's will)

   Nem akartunk télen szabadságra menni, de a gyerekek meggyőztek és mi beadtuk a derekunkat. ― We didn't want to go on vacation during the winter, but the kids convinced us and we caved in.

• For the verb, see the definite conjugation of bead.
• The inflected noun derék takes the appropriate possessive suffix according to the subject of the sentence plus the accusative suffix: derekam/derekamat, derekad/derekadat, derekát, derekunkat, derekatokat, derekukat.