Verb + 一下
When 一下 follows a verb, it can suggest trying an action or doing something briefly and lightly. This usage makes commands and suggestions sound friendlier and less forceful. It is one of the most common ways to soften the tone of a request in everyday Chinese.
你穿上试一下,看看合不合适。
nǐ chuān shàng shì yíxià, kànkan hé bù héshì.
Put it on and try it to see if it fits.
这个方法你用一下,说不定有效。
zhège fāngfǎ nǐ yòng yíxià, shuōbudìng yǒuxiào.
Give this method a try; it might work.
你听一下这首歌,特别好听。
nǐ tīng yíxià zhè shǒu gē, tèbié hǎotīng.
Listen to this song; it sounds really great.