5 sentences

1. 我要签下你。

   wǒ yào qiān​xià nǐ.

   I want to sign you.

   Source: OpenSubtitles

2. 他逼我签下了这份不平等的合同。

   tā bī wǒ qiān​xià le zhè fèn bù píng​děng de hé​tong.

   He forced me to sign this unfair contract.

   Source: Dong Chinese Dictionary

3. 他花了不少心机才最终说服客户签下合同。

   tā huā le bù​shǎo xīn​jī cái zuì​zhōng shuō​fú kè​hù qiān​xià hé​tong.

   He put in a lot of effort to finally convince the client to sign the contract.

   Source: Dong Chinese Dictionary

4. 为了防止对方反悔，他决定抢先一步签下合同。

   wèi​le fáng​zhǐ duì​fāng fǎn​huǐ, tā jué​dìng qiǎng​xiān yī bù qiān​xià hé​tong.

   To prevent the other party from backing out, he decided to strike first and sign the contract.

   Source: Dong Chinese Dictionary

5. 多亏了同事们的神助攻，我才顺利签下了那个大合同。

   duō​kuī le tóng​shì men de shén​zhù​gōng, wǒ cái shùn​lì qiān​xià le nà​gè dà hé​tong.

   Thanks to the incredible support from my colleagues, I was able to sign that big contract.

   Source: Dong Chinese Dictionary