Telefrag

"Telefrag" was a term used by Earth Empire Marine Corps in the 34th century for the process of transmatting into the same position as someone else, the result is death. (MA: The Dark Path) On Earth in the 20th century the Seventh Doctor altered the Imperial Daleks' transmat to perform a similar function by forcing "one half of the Dalek to materialize where its other half was materialising. The two halves tried to coexist at the same point. The resulting reaction destroyed it.". (DW: Remembrance of the Daleks)