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

拍手を打つ[kashiwadewoutsu] to clap one's hands in prayer
口拍子[kuchibyoushi] counting time orally
三拍子[sanbyoushi] triple time (music)
手拍子[tebyoushi] beating time
心拍[shinpaku] heart rate

二拍子[nibyoushi] duple meter
拍子木[hyoushigi] wooden clappers
拍車[hakusha] (riding) spur
拍車をかける[hakushawokakeru] to spur (on)
拍手[hakushu] clapping hands