请坐 (qǐng zuò) means “please sit down”

More examples

老师说：请坐下，我们开始上课。lǎo shī shuō qǐng zuò xià wǒ men kāi shǐ shàng kè

The teacher said, "Please sit down; let's begin class."

A respectful host pauses to offer someone a place to sit.

坐zuò: To sit on a chair or on the ground.
坐下zuò xià: To move from standing into a sitting position.

用于邀请他人坐下的短语，语气礼貌，常见于接待和正式场合。yòng yú yāo qǐng tā rén zuò xià de duán yǔ yǔ qì lǐ mào cháng jiàn yú jiē dài hé zhèng shì chǎng hé

请 (qǐng, "please") + 坐 (zuò, "sit") combines a courteous request with the action of sitting, which explains its use in formal welcomes and meetings.

At a school event, office, or shop, this phrase can welcome a guest; close friends often choose a more casual invitation.