in 3.x I generally discribe it as one "real" swing. Like Imret said I'll usually discribe it as containing a brief feint a swung fist or a testing jab but that's about it. For example if a traditional sword and board fighter scores a hit on an orc I might say something like:
"you recover after reeling back from his previous swing which knocked a chunk out of your shield, he raises his sword to bring it on your head but you kick his knee hearing a satisfying crunch, as he bellows in pain you swing your sword in a wide arc and see it bite into the chainmail links over his ribs."
I have a list of various brief combat discriptions that I have written up previously with general guidelines on which one to use if someone did a little damage, moderate damage, or a lot of damage. I find it makes the combat a great deal more cinimatic and engaging even if it does slow things down a little.
Also every "hit" doesn't nessesarally mean you hit him with your blade. A lousy damage roll might mean that you locked blades with him and instead punched him in the face with the pommel of your sword, kicked him in the groin, caught him in the jaw with your shield sometimes even drawing another weapon like a dagger and stabbing him with that ect. Melee combat should be messy violent affairs with even the most alturistic of paladins using dirty tricks, headbutts, suckerpunches, improvised weapons and the terrain to try and take advantage of their opponant.