Used other than figuratively or idiomatically: see 一, 発. / doing something only once / (baseball, informal) home run

beat; attack

(hairstyle) queue; pigtail

party trick

one-hit wonder

set off, depart / start from / emit / discharge / disclose / occur

departure

(by extension) Counter for other things which are "fired". / Counter for artillery fire. Round.

firing pin

one day