从字面上看，短语 “overstep the mark” 的意思是 “超越界线”，它的实际意思是 “做出格、过分的事情”。在这个短语中，动词 “overstep” 的意思是 “超出、逾越”，而名词 “mark” 表示 “某事被允许或可以接受的限度”。
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例句
Connor really overstepped the mark when he shouted at Abi. You just can't do things like that!
康纳冲着艾比大喊大叫，真是太过分了。绝不应该有这样的行为！

I don't want to overstep the mark here, but I need to ask you about your family.
我不想问得太多，但我需要问问你的家庭情况。

I was friends with Siqi but she overstepped the mark when she didn't give that money back.
我和思琪本是朋友，但当时她不还钱，做得太过分了，越过了我的底线。