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Verb: loosen up
  1. Cause to become unblocked
    "The medicine loosened up my nose in minutes!";
    - unstuff
  2. Become less tense, less formal, or less restrained, and assume a friendlier manner
    "our new colleague loosened up when he saw that we were a friendly group";
    - relax
  3. Make one's body limber or suppler by stretching, as if to prepare for strenuous physical activity
    - limber up, warm up
  4. Rest from work; become less busy, tense or anxious
    "He loosened up in the hot tub";
    - relax, unbend, unwind, decompress, slow down
  5. Cause to feel relaxed
    - relax, unstrain, unlax, unwind, make relaxed

Derived forms: loosening up, loosened up, loosens up

Type of: act, affect, behave, change state, disengage, do, exercise, free, turn, work out