[day and night] or [night and day] {adv.}
1. For days without stopping; continually. Syn.: AROUND THE CLOCK.
* /Some filling stations on great highways are open day and night 365 days a year./* /The three men took turns driving the truck, and they drove night and day for three days./
2. Every day and every evening.
* /The girl knitted day and night to finish the sweater before her mother's birthday./