～おき

～おき indicates regular intervals. The number specifies how much time/space passes between each occurrence.

KEY POINT:
一日(いちにち)おき means "every other day" (with one day gap between). This can be confusing - the number indicates the interval, not the frequency.

EXAMPLES:

• 一日(いちにち)おき: every other day (Mon, Wed, Fri...)
• 二日(ふつか)おき: every third day (with two days between)
• 一時間(いちじかん)おき: every two hours
• 五分(ごふん)おき: every six minutes
• 三(さん)メートルおき: every three meters (spacing)

CONTRAST WITH ～ごとに:

• ～おき: interval between occurrences
• ～ごとに: each occurrence
• 一日(いちにち)おき = every other day
• 一日(いちにち)ごとに = every day

COMMON MISTAKE:
Learners often confuse 一日(いちにち)おき (every other day) with 毎日(まいにち) (every day).