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

其の実[sonojitsu] in fact
忠実[chuujitsu] faithful
果実[kajitsu] fruit
果実酒[kajitsushu] cider
果実店[kajitsuten] fruit store

花実[hanami] flowers and fruit
核実験[kakujikken] nuclear (bomb) test
核兵器実験[kakuheikijikken] nuclear test
確実[kakujitsu] certainty
確実性[kakujitsusei] certainty