If you don't stop teasing your sister, there'll be tears before bedtime.
Если ты не перестанешь дразнить свою сестру, будут слёзы перед сном.
Definitions
A phrase used to suggest that something upsetting or disappointing is likely to happen, often as a result of an argument, mishap, or conflict, especially before the end of the day. It is commonly used in a lighthearted or warning manner, particularly with children, to indicate that someone's actions may lead to crying or distress before going to bed.