1. have an ax to grind
心懷叵測
如：She always has an ax to grind. You should take whatever she says with a pinch of salt.
她總是心懷叵測，對她說的話你得多留神 。
2.not have one’s heart in the right place
心術不正
如：He doesn’t have his heart in the right place. He would find every opportunity to stab in the back of others.
他的心術不正，動不動就在別人的背後捅刀子。
3. stab in the back
背後捅刀子
如：I was taken aback and didn’t think Zhang would stab me in the back. I placed too much trust in her.
我萬萬沒想到張某會在背後捅我一刀。我過去太信任她了。
4. badmouth somebody
說某人的壞話
如：I’ve never badmouthed anyone.
我從來沒說過任何人的壞話。
5. beef
發牢騷
如：I’m really bored with his sitting there doing nothing but beefing.
他坐在那裏什麼事也不幹，總是發牢騷，真煩死人。
6.speak with one’s tongue in one’s cheek
假惺惺的說
如：I feel sick of her. She always speaks with her tongue in her cheek.
我特別討厭她。她說話總是假惺惺地。
10. smite with the tongue
血口噴人
如：Don't offend her. She always smites with the tongue.
千萬別得罪她，她經常血口噴人。