Commit - definition # 3 b : to pledge or assign to some particular course or use <commit all troops to the attack>
To commit an attack is to assign your attack to some particular course or use. In the event of aikido training, its purpose is to hit the nage is he's taking too long or to miss him and be where you are supposed to be in such a manner for nage to execute a technique.
Please notice: no where in the definition does it mention "systematic destruction."
In essence, you are putting forth an attack, time after time, in order for the nage to train and understand what to do with that attack. Training is a set up!
As nage, its your job to get off line and receive the attack in such a manner as to not be harmed. It is your DUTY to NOT get hit! If you do, Uke will feel bad but it is ultimately the Nage's problem to worry about the attack, not Uke. Uke is there to do what he's told: "Shomen uchi!"... Okay, strike to the head. Look out, buddy! Here it comes! "Kiai!" chop
Maybe it's a committed attack to a specific part of the opponent, like the stomach.
Excellent point, Chris. A committed attack doesn't mean that once you strike shomen uchi... because you missed, you then have to turn and start throwing punches and kicks and keep going after the guy. He either does the technique or he doesn't... in which case, you attack again in a new unit of time just as before. And... attacks are given in a specific manner such as to the head, side of the head, chest, wrist grab, shoulder grab, etc.
Also realize that as skills improve and people move up in rank, you can also accelerate the intensity of the attack. As a total newbie to aikido, Sensei could yell "Get off line!" but a seriously committed attack would have had me frozen in my tracks! Time needs to be taken with newer people so that they can develop the habits and skills needed later on. Speed comes later and is
different from committment.
There is no anger or malice in committment, only intention and follow-through. Without it, aikido really would be a dance.