Obliterate
WordNet
adjective
(1) Reduced to nothingness
verb
(2) Remove completely from recognition or memory
"Efface the memory of the time in the camps"
(3) Make undecipherable or imperceptible by obscuring or concealing
"A hidden message"
"A veiled threat"
(4) Do away with completely, without leaving a trace
(5) Mark for deletion, rub off, or erase
"Kill these lines in the President's speech"