Hello, Shaner. Stop in Korean is.. 멈추다 meonchuda (infinitive) 멈추세요 please stop 멈춰 stop! (familiar, rude form) Sometimes you could say 그만두다(geumanduda), 관두다(gwanduda), 중지하다(jungjihada) too as the meaning of 'stop doing something'.

그만하다, 멈추다, 정지하다. etc...:D