(Also known as DFA, also in some circles as DOA) A desperate form of attacking in which attacking BattleMech uses jump jets or height difference to jump on target BattleMech.
If executed properly, this attack does damage to both attacker (feet of the 'Mech take damage), and the target (upper torso, possibly head, and probably also pilot, takes damage). Since head is often the most vulnerable part of 'Mech (but hard to hit otherwise), this maneuver might be very devastating! However, due to high potential of foot damage for attacker, this attack is often discouraged, except in critical situations.
(See also: BattleTech)