ちょっと一杯[chottoippai] let's have a quick drink
ばつ一[batsuichi] being once divorced
一向[hitaburu] nothing but
サラダ一皿[saradahitosara] plate of salad

安全第一[anzendaiichi] safety first
一か八か[ichikabachika] sink or swim
一っ走り[hitoppashiri] spin (as in 'take a car for a spin')
一つ一つ[hitotsuhitotsu] one-by-one

一揆[ikki] uprising (esp. in Japan since middle ages, e.g. peasant uprising)
百姓一揆[hyakushouikki] peasant's revolt
農民一揆[nouminikki] agrarian revolt or uprising
徳政一揆[tokuseiikki] uprising (during the Muromachi period) demanding debt cancellation orders

ミュンヘン一揆[myunhenikki] Beer Hall Putsch (1923)
一向一揆[ikkouikki] Jodo Shinshu Buddhist uprising (Muromachi and Warring States periods)
土一揆[tsuchiikki] peasant uprising (Muromachi period)
国一揆[kuniikki] province-wide uprising (Muromachi period)