overwrite

Short definition from Wiktionary

Verb

1. 1
   To destroy (older) data by recording new data over it.
2. 2
   To cover in writing; to write over the top of.
3. 3
   To write too much.
4. 4
   To write in an unnecessarily complicated or florid way; to produce purple prose.

Noun

1. 1
   The operation of destroying older data by recording new data over it.