2 sentences for 两下 (liǎng​xià)

1. 等我两下，我马上就好。

   děng wǒ liǎng​xià, wǒ mǎ​shàng jiù hǎo.

   Wait for me a moment; I'll be ready soon.

   Source: Dong Chinese Dictionary

2. 他在门上敲了两下。

   tā zài mén shàng qiāo le liǎng​xià.

   He knocked on the door twice.

   Source: Dong Chinese Dictionary