〔野球で〕one ball and two strikes/one and two(▼米国ではボール,ストライクの順に数える)
ワン切りa one-ring phone scam
知らない相手だったら折り返し電話しないほうがいいよ.ワン切りかも
You shouldn't dial one-ring callers back if you don't know them. The phone system could be rigged to make it look like you've agreed to pay for something really expensive.
ワンペアー〔ポーカーで〕one pair
ワンメーター〔タクシーの初乗り運賃〕the starting fare; the base fare