Spanish phrase
Avísame si ~.
Meaning
Let me know if ___.
When to use it
A casual request to be informed if something happens. Used with friends or family to ask for an update about plans; informal and friendly.
Example dialogue
Avísame si vas a llegar tarde.
Let me know if you're going to be late.
De acuerdo, te avisaré si me retraso.
Okay, I'll let you know if I'm running late.