icebreaker

English Thesaurus

1. a beginning that relaxes a tense or formal atmosphere (noun.act)

hypernym	:	beginning, commencement, start,
definition	:	the act of starting something (noun.act)

2. a ship with a reinforced bow to break up ice and keep channels open for navigation (noun.artifact)

hypernym	:	ship,
definition	:	a vessel that carries passengers or freight (noun.artifact)