Some advice please … Does cofnij come from the verb ‘cofać’? Thanks!
Pretty much – it comes from “cofnąć”, which is the perfective equivalent of the imperfective “cofać”.
cofać (-am -asz) (impf), (pf) cofnąć (-nę -niesz cofnięty) (transitive) = to set back, back up, retract, reverse, withdraw. Intransitive ~ się = to go away, withdraw,