真的破冰：船
這一支就是字面本身。船頭壓上冰，冰裂開，後面的船跟著走。其他意思都是從這個畫面搬出去的。
noun · C1
A strong ship built to push through thick floating ice and cut an open channel, so that it and the ships behind it can keep sailing.
破冰船
核心畫面
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.
可以想成一片結冰的海面。一艘船用厚重的船頭壓上冰層，冰裂開，後面就留下一條水道。本來什麼都動不了，現在後面的船都能跟…更多收起
可以想成一片結冰的海面。一艘船用厚重的船頭壓上冰層，冰裂開，後面就留下一條水道。本來什麼都動不了，現在後面的船都能跟著走。icebreaker 可以想成負責「第一下」的那個東西。在海上，它是真的破冰的船。在一個安靜的房間裡，它是那個讓大家開口的小遊戲。在劇場裡，它是把場子炒開的開場歌舞。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.
Two branches
把場子打開：開場用的東西
把冰從海面搬到氣氛上。一群人剛見面、沒人開口，那種安靜就像結了一層冰；需要有人先壓一下，話才流得動。
noun · B2
A game, question, or joke that someone uses at the start of a meeting, class, or party so that people who do not know each other yet feel relaxed and begin talking.
破冰活動