"Lei ha lasciato suo figlio correre."

Translation: She has let her son run.

[stevecrozz]

I read it as 'she left her sun to run,' meaning she left her son, so she could go running. How would you say that in Italian?

[f.formica]

"Ha lasciato suo figlio per correre" (purpose subsentence); lasciare + infinitive is usually to let someone do something (similar to the French laisser, e.g. laissez faire).