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

金糸雀[kinshijaku] canary (esp. the island canary, Serinus canaria)
亜麻糸[amaito] flax yarn
綾糸[ayaito] colored thread
一糸[isshi] string
一糸まとわぬ[isshimatowanu] stark naked

一糸一毫[isshiichigou] tiny amount
下糸入れ[shitaitoire] shuttle
菌糸[kinshi] fungal filament
結紮糸[kessatsushi] ligature
原糸[genshi] thread for weaving