Something is coming straight at you. You do not back away and you do not stop. You put one foot out to the side, shift your weight, and it goes past you. Every use of sidestep can be held in that one step: you did not meet the thing head on, and it did not stop you either.
可以想成有東西朝你直直走過來。你不後退，也不停下來。你往旁邊踏出一步，重心一移，它就從你身邊過去了。sidestep 的每個意思都可以收在這一步裡：你沒有正面迎上去，也沒有被擋住，而是從旁邊讓它過去。
From the word’s history
Wiktionary gives sidestep simply as side + step, so the word says what it does: a step taken to the side.
Wiktionary 把 sidestep 拆成 side（旁邊）加 step（一步）。這個字本身就把動作說完了：往側邊踏出的那一步。
Wiktionary entry for sidestep (kaikki:3f6f69a190036ae4:855234875): From side + step.
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