Meaning: face the consequences/results of your actions.
Example: Tina said, “We all know that Gina is going through a difficult phase right now. But that does not excuse her rude behavior. She has been picking up fights with all her class mates for the past one week.”
Reema said, “Yes. I heard about her behavior. A few parents have already complained to the principal. She will have to face the music sooner or later.”
Tina hoped Gina would realize her mistake before it was too late.