buckle

/ˈbʌkəl/
noun
  1. A metal or plastic fastener used to join two ends of a belt, strap, or similar item.
    • The old leather belt had a shiny silver buckle.
    • He tightened the buckle on his seatbelt before the car started.
    • She fastened the buckle of her backpack strap.
Synonyms
verb
  1. To fasten or join with a buckle.
    • He buckled his suitcase shut for the flight.
    • She buckled the straps of her sandals.
    • Please buckle your seatbelt before we drive.
  2. To bend, collapse, or give way under pressure or strain.
    • The old bridge began to buckle under the weight of the truck.
    • The metal frame buckled in the intense heat.
    • His knees buckled when he heard the shocking news.
Antonyms
What does "buckle" mean? | whatsthatwordmean | whatsthatwordmean