一ひとつ置おきに

adverb

alternately; every other one

Used when selecting or arranging items at intervals of one, i.e., skipping one between each chosen item. Often used with nouns like 日 (day), 人 (person), or 席 (seat).

See also: 一つ置き

• この薬くすりは一ひとつ置おきに飲のんでください。

  Please take this medicine every other day.

• 一ひとつ置おきに席せきに座すわってください。

  Please sit in every other seat.