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

一挙両得[ikkyoryoutoku] killing two birds with one stone
一刀両断[ittouryoudan] cutting in two with a single stroke
一両[ichiryou] one vehicle
一両日[ichiryoujitsu] (a) day or two
一両年[ichiryounen] (a) year or two

賛否両論[sanpiryouron] the pros and cons
車両[sharyou] rolling stock
車両化[sharyouka] motorization
車両縦隊[sharyoujuutai] convoy
衆参両院[shuusanryouin] both houses of Parliament (Diet)

いい年をして[iitoshiwoshite] (in spite of) being old enough to know better
亥年[idoshi] year of the boar
一箇年[ikkanen] one year
一周年[isshuunen] one full year
一年以内に[ichineninaini] within a year

一年間[ichinenkan] (period of) one year
一年生[ichinensei] annual (plant)
一年草[ichinensou] annual (plant)
一年ぢゅう[ichinenjuu] all year round
一両年[ichiryounen] (a) year or two