make *something round / <<paper>> crumple *something into a ball / round / make a ball of *something / roll *something up (into a ball) / curl *oneself up
まろめる
maromeru
丸める JVE
roll *something up (into a ball) / curl *oneself up / make *something round / <<paper>> crumple *something into a ball / round / make a ball of *something