Meaning of the word "Sit up straight" in English

What does "Sit up straight" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

Sit up straight

US /sɪt ʌp streɪt/
UK /sɪt ʌp streɪt/

Phrase

to sit with your back straight and your shoulders back, in a good posture

Example:
The teacher told the students to sit up straight.
You should always try to sit up straight to maintain good posture.