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

一陣[ichijin] gust of wind
円陣[enjin] forming a circle
共産陣営[kyousanjinei] the Communist camp
軍陣[gunjin] camp
軍陣医学[gunjinigaku] military medicine

経営陣[keieijin] the management ranks
堅陣[kenjin] stronghold
殺陣[tate] sword battle (staged for television, etc.)
主陣地[shujinchi] main battle area
出陣[shutsujin] departure for the front