be as regular as clockwork

To happen at predictable intervals. My daughter starts crying every night at bedtime—it's as regular as clockwork.

if something is as regular as clockwork, it happens at exactly regular times Her letters arrived every week, regular as clockwork.

Name	Pronounced	Usage
Riika	REE:-kah	Finnish
Maxine	mak-SEEN	English
Siri	SEE-ree (Swedish)	Swedish, Norwegian, Danish
Miltiades	-	Ancient Greek
ValÉRio	-	Portuguese
Ludmila	-	Czech, Russian