Froma- +curcucho(“hunchbacked”) +-ar +se.
acurcucharse (first-person singular presentmeacurcucho,first-person singular preteritemeacurcuché,past participleacurcuchado)
1Mostly obsolete, now mainly used in legal language.2Argentine and Uruguayanvoseo prefers thetú form for the present subjunctive.