the first day of the month (solar or lunar calendar)

(literary) one day, 24 hours / (literary) the daytime, the period from dawn until dusk / (literary) (figuratively) a short period of time

(obsolete) one day, 24 hours / (obsolete) the daytime, the period from dawn until dusk

(rare, obsolete) (all senses appear to be identical as for hitohi above)

What? What did you say?

whatchamacallit, X

happening once a year

one-hit wonder

(sumo, martial arts) a quick shift of position / flexibility in adapting one's words and deeds to changing circumstances

what