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Verb: buckle up
  1. Fasten one's seatbelt
    "Remember to buckle up before we start driving"
     
  2. Prepare for a challenging or difficult situation
    "We need to buckle up for a tough quarter ahead"
     
  3. To secure or fasten something tightly
    "Buckle up your life jacket before getting on the boat"

Derived forms: buckles up, buckled up, buckling up