原意就是“回视肩膀”,又有“环视”的意思.
例如：What a relief it is not to have to look over your shoulder before you speak to a companion in a public place.
在公共场所里能和自己的同伴毫无顾忌地谈话,那是多么轻松啊.
look over one's shoulder 另有“窥探”的意思.