informal to be careful because other people may try to harm you 小心背后〔因可能有人暗算〕
Examples from the Corpus
watch your back• He may be primeminister for now, but he still needs to watch his back.• But Yeltsin will have to watch his back.• Drug traffickers and guerrillasmix with spies and mercenaries, all cautiously watching their backs.• Enjoy it, but watch your back.• She noticed that everyone seemed to have drifted a little closer; was talking a little less, watching their backs.• She watched his back for a moment.• Other agents are watching his back, he says.• Besides which, I needed an ally at the shop, some one to watch my back should things get hairy.• But watch your back when I get out, all right?