baixessis

form-of imperfect second-person singular subjunctive

「baixar」のあなた（君）にあたる単数形の未完了接続法（仮定法過去）の活用形

English Meaning

second-person singular imperfect subjunctive form of baixar

Si baixessis al jardí, veuries com han florit les roses.

もし君が庭に降りてきたら、バラが咲いているのが見えるだろう。

If you were to go down to the garden, you would see how the roses have bloomed.