What does the spanish word sientate mean in English?

The Spanish word "sientate" is an informal imperative verb meaning "sit down".

It is the informal command form of the verb "sentarse" (to sit down).

Here's a breakdown:

* Sientate: informal command, used with friends or family.

* Siéntese: formal command, used with someone you don't know well or someone you are showing respect to.

So, the correct English translation of "sientate" is "sit down".