没什么
The phrase 没什么 (méi shénme) means "it's nothing" or "nothing much" and is used as a casual response to dismiss or downplay something. It is a common conversational expression to show modesty or reassure someone.
谢谢你帮忙!——没什么,应该的。
xièxie nǐ bāngmáng! — méi shénme, yīnggāi de.
Thanks for the help! — It's nothing, don't mention it.
你怎么了?——没什么,就是有点累。
nǐ zěnme le? — méi shénme, jiùshì yǒudiǎn lèi.
What's wrong? — Nothing, just a little tired.
这件事没什么好担心的。
zhè jiàn shì méi shénme hǎo dānxīn de.
There's nothing to worry about with this matter.