"racing" in the noun sense
the sport of engaging in contests of speed
"racing" in the verb sense
1. rush, hotfoot, hasten, hie, speed, race, pelt along, rush along, cannonball along, bucket along, belt along, step on it
"He rushed down the hall to receive his guests"
"The cars raced down the street"
2. race, run
compete in a race
"he is running the Marathon this year"
"let's race and see who gets there first"
to work as fast as possible towards a goal, sometimes in competition with others
"We are racing to find a cure for AIDS"
4. race, rush
cause to move fast or to rush or race
"The psychologist raced the rats through a long maze"
Source: WordNet® (An amazing lexical database of English)
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