This is the 4884th most frequent Catalan word.
tocant
"Touching" or "near/next to."
Here, 'tocant' is used to mean 'playing' an instrument, showing the action of making music.
Estic tocant la guitarra.
I am playing the guitar.
In this context, 'tocant' refers to knocking on something, indicating the act of creating sound by tapping.
Ell estava tocant la porta per veure si hi havia algú.
He was knocking on the door to see if anyone was there.
Here, 'tocant' is used metaphorically to mean coming close to something, like a boundary or limit.