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

熟々[tsukuzuku] completely
円熟[enjuku] ripeness
黄熟[koujuku] ripening and turning yellow
噛熟す[kamikonasu] to chew
完熟[kanjuku] completely ripe or mature

使い熟す[tsukaikonasu] to handle (men)
四字熟語[yojijukugo] four-character idiomatic compounds
修熟[shuujuku] developing skill
習熟[shuujuku] skilled
熟す[jukusu] to ripen