A ship designed to break through ice so that it, or other ships coming behind, can navigate on frozen seas. Example: The steel hulls of ice-breakers are much thicker than those of standard vessels.
A game, activity, humorous anecdote, etc., designed to relax a group of people to help them get to know each other. Example: The new college hallmates were awkward with each other at first, but after a game of charades as an icebreaker, they were laughing like old friends.
A lively song and dance routine at the start of a musical.
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