Tom Brady was asked to define what 'pressure' means to him: "Pressure is knowing exactly when something is on the line. Something critical is there to gain … I think that's the pressure to grab hold of something and obtain something that maybe a lot of ways -- that's a (expletive deleted) definition. What the hell am I talking about? That was pathetic -- do we need to answer with that one?"
That's a pretty good definition, as good as any, I'd say.