icebreaker
noun [ C ] uk/ˈaɪsˌbreɪ.kər/ us/ˈaɪsˌbreɪ.kɚ/
(ACTIVITY)
（彼此不认识的人见面时）活跃气氛的游戏（或笑话）
a game or joke that makes people who do not know each other feel more relaxed together
(SHIP)
破冰船
a strong ship that can break a passage through ice