One way to hold this word: a short sideways push that takes something off the main line and puts it on another one. The clearest place to see it is a rail yard. A small engine comes up behind a carriage, pushes it a little way, and the carriage is now on a different track. Nothing travelled far. Nothing moved itself. And the new line is a side line, not the main one. Every other use of the word is that same short push with something else in the carriage's place: a person, a plan, a current, a stream of blood, or a car that did not want to be touched.
From the word’s history
The packet traces the word to Middle English schonten, schunten, 'to jerk, swerve; to dodge, escape', with two possible routes behind it: a back-formation from schonen (Old English scunian, the ancestor of shun), or an altered form of an Old English word meaning 'to hasten, hurry'. The source marks both routes as uncertain, and a jerk or a swerve is exactly the sudden sideways move the modern word still describes.
依證據包所附的字源，這個字可以追到中古英文 schonten / schunten，意思是「猛然一動、閃開、躲掉」。再往前有兩條可能的路：一條是從 schonen（古英文 sċunian，也就是 shun 的祖先）倒推出來，另一條是古英文「趕快、催促」那個字的變形。來源本身就把這兩條標成不確定，所以只能當線索看。不過無論哪一條，「猛然偏一下」都正好對上今天這個字的畫面：短、突然、往旁邊。
Wiktionary, "shunt"
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