三日(みっか)

三日(みっか) has two meanings: a duration of three days, and the 3rd day of the month. Context usually makes the meaning clear.

Days of the month (1-10)

• 一日(ついたち), 二日(ふつか), 三日(みっか), 四日(よっか), 五日(いつか)
• 六日(むいか), 七日(なのか), 八日(ようか), 九日(ここのか), 十日(とおか)

Common expressions

• 三日(みっか)間(かん): three days (with counter)
• 三日(みっか)後(ご): three days later
• 三日(みっか)前(まえ): three days ago

三日(みっか)坊主(ぼうず) literally "three-day monk" means someone who gives up easily or lacks perseverance. Used when someone starts something but quickly abandons it.