Implosion

When two versions of the Doctor's TARDIS collided, the Tenth Doctor, after witnessing himself doing so in his fifth incarnation, combined a black hole and a supernova to stop a black hole from being created, observing that the explosion cancelled out the implosion. (TV: Time Crash)

A damaged Zectronic Beam Controller threatens to both explode and implode before being fixed by the Twelfth Doctor. (TV: The Curse of Fatal Death)