一下
yí xià
Verbing briefly with "yixia"
一下 after a verb means "for a moment" — the politest way to ask for something small.
Verb + 一下
How it works
你看一下 (have a quick look), 等一下 (hang on a second), 帮我一下 (give me a hand).
It works exactly like verb reduplication and the two are interchangeable in most requests.
With an object, 一下 comes between verb and object: 看一下这个.
Examples
nǐ kàn yí xià
你看一下。
Have a quick look.
děng yí xià!
等一下!
Hang on a second!
nǐ néng bāng wǒ yí xià ma?
你能帮我一下吗?
Could you give me a hand?