1、Their battle cry will be: "Sign this petition before they sign away your country."
他們吶喊的是：“在他們賣國之前，在請愿書上簽名。”

2、They are willing to sign away their entire worldly possessions.
他們愿意簽字放棄所有財產(chǎn)。

3、The British government is not about to sign away its control of the island.
英國政府不想簽字放棄權(quán)其對該島的控制權(quán)。

sign away翻譯