keep to
US /kiːp tuː/
UK /kiːp tuː/

1.
mantenerse en, ceñirse a
to obey a rule or to continue to do something without changing
:
•
You must keep to the speed limit.
Debes mantenerte en el límite de velocidad.
•
Let's keep to the original plan.
Vamos a mantenernos en el plan original.