This is the 12429th most frequent Polish word.
nabrać
To gain, collect, scoop, gather, or deceive (context-dependent).
In this sentence, 'nabrałem' comes from 'nabrać' and means to gather or fill with (water, in this case).
Nabrałem wody do wiadra.
I filled the bucket with water.
Here, 'nabrał' refers to gaining or obtaining something, specifically strength.
On nabrał siły po odpoczynku.
He regained strength after resting.
In this case, 'nabrała' means to trick or deceive someone, demonstrating a figurative use of the word.