one day

the daytime, during the day / a half day, half of a day

(rare) the first day of the month

all day, throughout the day, sunrise to sunset, all around the clock

waiting on someone

wait on someone

(literary) they (about women or girls)

(colloquial) a girlfriend (a female partner in a romantic relationship)

(formal) Female third-person singular pronoun; she, her, girlfriend

grandmother