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
Kumar	-	Indian, Hindi, Marathi, Bengali, Assamese, Odia, Gujarati, Punjabi, Tamil, Telugu, Malayalam, Kannad
Hersilia	-	Roman Mythology
Cathryn	KATH-rin	English
Alessandra	ahl-e-SAHN-drah	Italian
Diane	[dai'æn]
Xavi	-	Catalan