This is the 13634th most frequent Polish word.
pobić
"To beat" or "to hit."
In this sentence, 'pobić' is used metaphorically to mean achieving a new personal best or surpassing a previous achievement.
On pobił swój rekord w biegu na 100 metrów.
He broke his record in the 100-meter run.
Here, 'pobić' reflects a physical conflict or altercation, used in a reflexive form 'pobiły się', denoting that the action is mutual among participants.
Dzieci pobiły się na placu zabaw.
The children fought on the playground.
In this case, 'pobić' literally means to strike repeatedly as a method of cleaning or dusting off a surface, specifically with a carpet.