Picture a sea frozen over, with a ship pushing its heavy bow up onto the ice until the ice cracks and a lane of open water opens behind it. Nothing could move before; now everything can follow. An icebreaker is whatever gives that first hard push — a ship through real ice, a game through a silent room, a loud opening number through a restless audience.
From the word’s history
The word is simply ice + breaker, and it named the ship first. English already had the expression break the ice for easing a stiff situation, and the noun was carried over to the thing that does that.
這個字就是 ice（冰）加 breaker（把東西弄破的人或機器），最早指的是破冰船。英文本來就有 break the ice 這個說法，用來講化解僵局。名詞 icebreaker 後來被借去指做這件事的東西。
Wiktionary entry for icebreaker supplied in this evidence packet (source_ref kaikki:3f6f69a190036ae4:1146047491): From ice + breaker, in the figurative sense from the expression to break the ice.
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