[Avodah] What does "teruah" mean?

[Simon Montagu]

On Mon, Sep 9, 2019 at 4:44 PM Zev Sero via Avodah <avodah at lists.aishdas.org>
wrote:
> AIUI the Kara'im understand it to mean "to make a loud noise", so on Yom
> Teruah (which they refuse to call Rosh Hashana because that's in Nissan)
> they shout.  Of course they're wrong about the mitzvah, but they can
> probably be trusted about the word's literal meaning.

A related question: in Joshua 6 when all the people "hari`u teru`a gedola",
did they shout a great shout, or sound a great teru`a on shofarot?