racing
v.-
1 moving very fast (v.) B1 Intermediatemoving at a very high speed or competing against others.
the present participle of 'race', indicating rapid motion or the act of engaging in a speed competition.
ExampleI could feel my heart racing after I finished the long run.
ExampleThe two cyclists were racing toward the finish line, neither one willing to yield even an inch of ground in the final sprint.
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2 thinking quickly (v.) B2 Upper Intermediatewhen your mind is full of many fast thoughts, often because you are excited or worried.
the state of one's thoughts moving uncontrollably or rapidly, typically due to anxiety, adrenaline, or intense excitement.
ExampleHer mind was racing with all the things she had to do before the trip.
ExampleDespite the calm exterior he maintained during the interview, his mind was racing as he tried to anticipate the panel's next technical question.
By surface analysis, race + -ing.