noun
Refers to the way circumstances or luck turn out, often with a sense of something beyond one's control. Commonly used in expressions like 回り合わせが悪い (unlucky) or 回り合わせで (by chance).
回り合わせが悪くて、旅行の日に台風が来た。
As luck would have it, a typhoon came on the day of our trip.
Many things in life are decided by fate.
Compound of 回り (まわり, 'turning, revolving') and 合わせ (あわせ, 'joining, matching'), literally 'the way things come around together'. The exact historical derivation is uncertain, but it likely developed from the idea of circumstances aligning or turning.