by the day

one day at a time. I don't know when I'll have to leave town, so I rent this room by the day.

by the day

Also, by the hour or week or month or year . According to a specific time period, as in I'm renting this car by the day, or He's being paid by the hour. This usage generally describes some kind of rate. [1400s]

Common Names:

Name	Pronounced	Usage
Kala (1)	-	Tamil
Jordanes	-	Ancient Germanic
Jaylon	JAY-lən	African American (Modern)
Meheitav'el	-	Biblical Hebrew
Ji-Yu	jee-yoo	Korean
Hildur	-	Icelandic, Norwegian