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

一駒[hitokoma] scene
駒鳥[komadori] Japanese robin (Erithacus akahige)
三味線の駒[shamisennokoma] bridge of shamisen
荒駒[aragoma] wild or untamed horse
手駒[tegoma] (game pieces, soldiers, etc.) under one's control

野駒[nogoma] Siberian rubythroat (Luscinia calliope)
駒下駄[komageta] low wooden clogs
駒落ち[komaochi] handicap (in shogi)
持ち駒[mochigoma] a captured piece than can be reused (shogi)