/ ˈəʊvərɑːm; NAmE ˈoʊvərɑːrm/ ( especially BrE ) (also over·hand especially in NAmE ) adverb
if you throw a ball overarm , you throw it with your arm swung backwards and then lifted high above your shoulder
► over·arm ( especially BrE ) (also over·hand especially in NAmE ) adjective :
an overarm throw
—compare underarm