頂替

to replace

apex / crown of the head / top / roof / most / to carry on the head / to push to the top / to go against / to replace / to substitute / to be subjected to (an aerial bombing, hailstorm etc) / (slang) to "bump" a forum thread to raise its profile / classifier for headwear, hats, veils etc

to substitute for / to take the place of / to replace / for / on behalf of / to stand in for

to assume sb's name and take his place (idiom); to impersonate / to pose under a false name

impersonator / impostor