“使放心”常见的英文表达有 “put one's mind at ease” 、“reassure someone” 或 “set someone's mind at rest”，具体使用可根据语境选择：
Put one's mind at ease：强调让某人内心感到平静、安心，不再担忧。例如：The doctor's explanation put my mind at ease.（医生的解释让我放了心 。）
Reassure someone：侧重于通过言语或行动，让某人消除疑虑、恢复信心，变得安心。例如：I tried to reassure her that everything would be fine.（我试图让她放心，一切都会好起来的。）
Set someone's mind at rest：意思是让某人的担忧、焦虑等情绪平息下来，不再纠结。例如：The test results set his mind at rest.（检测结果让他放了心 。 ）