clock at

clock (someone or something) at (a certain speed)

To track the speed at which someone or something moves. (The speed is stated after "at.") You're getting a ticket because I clocked you at 90 miles an hour—and the speed limit here is only 55.See also: certain, clock

clock someone or something at something

to measure the speed of someone or something to be a certain figure. I clocked the runner at a record speed for the race. Karen clocked the race at three minutes flat.See also: clock