苦口婆心的英文：
[Literal Meaning]
to earnestly and repeatedly exhort/grandmother/heart
to exhort earnestly like a kindhearted grandmother

[解释]
善意而又耐心地劝导。

[Explanation]
to advise in earnest words and with good intention

[例子]
经过叔叔、阿姨苦口婆心的劝导，她终于决定去见见那个男孩。

[Example]
Persuaded by both her uncle and her aunt, she decided to go to see the boy finally.

[英文等价词]
to bend someone's ear

To exhort or remonstrate with earnest words prompted by a kind heart
苦口婆心