put one's hand on one's heart

网络释义

1.	作出庄严保证 ... put one's hand on 触, 摸 put one's hand on one's heart 作出庄严保证[声明] put one's hand to 动手干; 着手去做(某事) ... zhidao.baidu.com
2.	做出庄严声明 hand的用法 ... put one's hand on one's heart 做出庄严声明(或保证) put the last hand to 做最后几笔(或润色)；完成 ... www.yinghanhuyi.com

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