icebreaker

Noun
  1. A ship with a reinforced bow to break up ice and keep channels open for navigation (synset 103562172)
    is a type of: ship - a vessel that carries passengers or freight
    same as: iceboat
  2. A beginning that relaxes a tense or formal atmosphere (synset 100240633)
    "he told jokes as an icebreaker"
    is a type of: beginning, commencement, start - the act of starting something

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