fielest um

form-of second-person singular subjunctive-ii

umfallenの二人称単数接続法II形

English Meaning

second-person singular subjunctive II of umfallen

Wenn du den starken Wind ignorieren würdest, fielest um, weil du dein Gleichgewicht verlierst.

もし強い風を無視すれば、バランスを崩すので倒れるでしょう。

If you were to ignore the strong wind, you would fall over because you lose your balance.