プログレッシブ和英中辞典(第4版)の解説
まぎわ【間際・真際】
出発間際に電報が来た
Just as we were leaving, we received the telegram.
試験間際に病気になった
He fell ill 「just before [on the eve of] the examination.
間際になって招待を断るのは失礼になる
It would be rude to turn down an invitation 「at the last moment [at the eleventh hour].