2 sentences for 不下 (bù​xià — at least)

1. 参加这次会议的人数不下五十人。

   cān​jiā zhè cì huì​yì de rén​shù bù​xià wǔ​shí rén.

   No fewer than fifty people attended this meeting.

   Source: Dong Chinese Dictionary

2. 他零食吃得太多，结果正餐反而吃不下了。

   tā líng​shí chī de tài duō, jié​guǒ zhèng​cān fǎn'ér chī bù​xià liǎo.

   He ate too many snacks, and as a result, he couldn't eat his main meal.

   Source: Dong Chinese Dictionary