"I have to go down."

Translation: Je dois descendre.

[Roger866787]

I thought 'en bas' was 'down'?

[auyuittuq]

en bas - preposition (ex. en bas des escaliers - located down the stairs)

descendre - verb (ex. descendre les escaliers - going down the stairs)

[Youngsil1]

I thought “Je dois me descendre” is correct...

[Christina-10]

As the hint suggested: Il faut que je descends.