三日

プログレッシブ和英中辞典(第4版)

みっか【三日】

〔３日間〕(for) three days

三日目
the third day

三日とあげず
very often／almost every other day

三日おきに
every fourth day／every four days

三日天下

a short-lived reign

三日坊主

彼は三日坊主だ
He can't stick to anything.／He can't keep his resolutions longer than a day or two.

出典　小学館「プログレッシブ和英中辞典(第4版)」