Meaning of the word "Be sure to" in English

What does "Be sure to" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

Be sure to

US /bi ʃʊr tə/
UK /bi ʃɔː tə/

Phrase

used to tell someone to remember to do something

Example:
Be sure to lock the door when you leave.
Be sure to call me when you arrive.