icebreaker

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. a ship with a reinforced bow to break up ice and keep channels open for navigation
• Syn:
iceboat
• Hypernyms:
ship
2. a beginning that relaxes a tense or formal atmosphere
- he told jokes as an icebreaker
• Hypernyms:
beginning, start, commencement