The Aside is when a character is standing on stage talking with the others and then wanted to say a word or a short sentence but is not directed to the actors, so the character turns his head and says the word and the audience is supposed to hear him while the other characters pretend they do not hear him or really they do not hear it. It is called aside because the character turns his head as there are other characters on stage whom he did not speak this aside to them. So, the aside is short all the time, it is either one word or one sentence
هذا موجود عندي بس لسه ماقريته