动词凭…发誓

1. 发誓：swear off 发誓戒除 | swear on 发誓 | swear to 断言

2. 凭...起誓：swear off [口]发誓戒(酒等), 发誓不再, 答应放弃 | swear on 凭...起誓 | swear out [美]由宣誓而得到