mark off (someone's) calendar

Translations
отмечать в календаре
I marked off my calendar for our vacation week.
Я отметил в календаре нашу неделю отпуска.
Definitions
To indicate on someone's calendar that a specific date or period is reserved or unavailable, often by drawing a mark or making a note, usually to avoid scheduling other activities at that time.
Words
mark

verb
отметить
off

adverb
отметить отдельно
someone's

pronoun
чей то
calendar

noun
календарь