Every other day; occurring on alternate days (can be used as noun or adverb).
この薬は一日置きに飲んでください。
Please take this medicine every other day.
庭の水やりは夏でも一日置きで十分だ。
Even in summer, watering the garden every other day is enough.
ゴミの回収は一日置きなので出す日を確認しておいてください。
Garbage is collected every other day, so please check which days to put it out.