obliterate

adjective

1
remove completely from recognition or memory
efface the memory of the time in the camps
2
make undecipherable or imperceptible by obscuring or concealing
a hidden message
a veiled threat
3
do away with completely, without leaving a trace
4
mark for deletion, rub off, or erase
kill these lines in the President's speech

Also useful for “obliterate”:Crossword— A long fill for tough grids