一いっ旦たん緩かん急きゅうMeaningsExpression1. (when) danger threatens; should an emergency occur (Yojijukugo)Kanji used一one旦start of a day緩become loose急hurryComposed of一いっ旦たんonce; for a short time; briefly; temporarilyAdverb緩かん急きゅうhigh and low speed; fast and slow; pace; tempo; lenience and severity; emergency; crisis; dire situationNoun