it was so cold that my teeth were chattering

chatter [ˈtʃætə^r]

AN (gen) charla f; (excessive) cháchara f, cotorreo m; [of birds, monkeys] parloteo m

BVI[person] (gen) charlar; (excessively) estar de cháchara, cotorrear; [birds, monkeys] parlotear
her teeth were chattering le castañeteaban los dientes
she does chatter so es muy habladora
stop chattering! ¡silencio!