1- The word “Dajjal” became a title given to the lying, one-eyed, false messiah. The Dajjal is so called because he will conceal his kufr from the people by lying to them, deceiving them and confusing them. 2- The Dajjal (al-Masih al-Dajjal) is the liar who leads people astray, the messiah of misguidance who will tempt people by means of the signs that he is given, such as bringing down rain, reviving the earth to bring forth vegetation, and other “miracles.” For more, see the detailed answer.