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

今宵[koyoi] this evening
春宵[shunshou] spring evening
宵の口[yoinokuchi] nightfall
宵越し[yoigoshi] (kept) overnight
徹宵[tesshou] all night

半宵[hanshou] midnight
宵宮[yomiya] eve of a festival vigil
宵っ張り[yoippari] night owl
宵積み[yoizumi] goods loaded in the afternoon for delivery the following morning