1. 1〔間違ってする〕
    • 計算をしそこなう
    • make a mistake in arithmetic/make an error in one's calculations
  1. 2〔ずさんにやる〕
    • 計画をしそこなった
    • 《口》 We bungled [botched/made a mess of] the plan.
  1. 3〔機会を逃す〕
    • 母の病気で留学しそこなった
    • On account of my mother's illness I missed the chance to go abroad to study.