icebreaker
ice·break·er / ˈīsˌbrākər/ • n. a ship designed for breaking a channel through ice. ∎ a thing that serves to relieve inhibitions or tension between people, or start a conversation. ∎ a thing that breaks up moving ice so as to lessen its impact, esp. a structure protecting the upstream end of a bridge pier.
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icebreaker
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icebreaker