whiznoun [ C ]
us/hwɪz, wɪz/infmlwhiz noun [ C ] (EXPERT)
a person with a very high level of skill or knowledge in a particular area:
Everyone knows at least one computer whiz.
Jo was one of those whiz kids who are millionaires by the time they’re 25.
whizverb [ I always + adv/prep ]
us/hwɪz, wɪz/-zz-whiz verb [ I always + adv/prep ] (MOVE FAST)
to move very fast:
He whizzed through the job but made lots of mistakes.