schreib fest

form-of imperative singular

festschreibenの単数命令形

English Meaning

singular imperative of festschreiben

Schreib fest alle Termine in deinen Kalender, damit du sie nicht vergisst.

忘れないように、すべての予定をカレンダーにしっかり書き留めなさい。

Write down all the appointments in your calendar so that you don't forget them.