Whats "understand or understood" in korean?

Question

isnt it ariso//araso <-- spelt it wrong :P

Answer 1

Its when they nod their heads.

Answer 2

ara so is &quot;I understand&quot;, the way you would say it to a peer.

A more respectful way would would be &quot;ara so yo&quot;, or &quot;ara sum ni da&quot;