by the hour

at each hour; once each hour. It kept growing darker by the hour. I have to take this medicine by the hour.

Name	Pronounced	Usage
Maiara	-	Native American, Tupí
TiÊN	-	Vietnamese
Ottomar	-	German
Aoi	ah-o-ee	Japanese
Edie	EE-dee	English
Hailwic	-	Ancient Germanic