Not P but Moby-Dick (6)

[Mike Jing]

The following excerpt is from Chapter 24:

No dignity in whaling? The dignity of our calling the very heavens attest.
Cetus is a constellation in the South! No more! Drive down your hat in
presence of the Czar, and take it off to Queequeg!

What does "drive down" mean here? Some of the previous translations
interpreted it as "remove", which doesn't seem right.