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Noun: icebreaker  'Is,brey-ku(r)
  1. A ship with a reinforced bow to break up ice and keep channels open for navigation
    - iceboat
  2. A beginning that relaxes a tense or formal atmosphere
    "he told jokes as an icebreaker"

Derived forms: icebreakers

Type of: beginning, commencement, ship, start

Encyclopedia: Icebreaker