They can overwrite headlines and rewrite articles on news sites such as this one.
Aymer had sought rather to overwrite the rude scrawl of Marley Sartin than to erase it.
1690s, "to write over other writing," from over- + write (v.). Of computers, it is attested from 1959. Meaning "to write too elaborately or ornately" is from 1923. Related: Overwriting; overwritten.