Spanish to English Law/Patents Law: Contract(s) sentencia (causa penal)

Judgment in a murder case from El Salvador. The witness is describing the murder:

el dicente (= el testigo que da la declaración) se corrió y se fue para su casa, él (= el asesino) ya no disparó y no vio que intentó más, porque el arma se le encasquilló, porque él le jalaba el arma y la estuvo **chegiando**, por lo que le dio con el corvo (...)

Basically the murderer shot the guy twice (failing to kill him), the gun jammed and he did **something** to it to try to dislodge whatever was jamming it and was unsuccessful, so proceeded to stab the poor guy.

The only thing I can think of is "shake", which would make perfect sense, and the word - which doesn't appear in any dictionary - may well be an approximation of the English "shake" ("shakeando").

That said, I'd appreciate any input/confirmation from colleagues, particularly from El Salvador.

Into U.S. English.