keep somebody at arm’s length 敬而远之；疏远
A：I have a feeling that Lily is not so close to Joe as she used to be.
B：Yeah, when she heard about his background,
she decided that she’d better keep him at arm’s length.
A：But Joe feels miserable.
A：我觉得莉莉对乔不像以前那么亲近了。
B：是啊，她听说他的背景后，就决定疏远他了。
A：可乔却觉得很痛苦。