frost

noun, verb

1 [U,C] a weather condition in which the temperature drops below 0ｰC (= FREEZINGPOINT) so that a thin white layer of ice forms on the ground and other surfaces, especially at night: It will be a clear night with some ground frost. * a sharp / hard / severe frost * There were ten degrees of frost (= the temperature dropped to -10ｰC) last night. * frost damage 2 [U] the thin white layer of ice that forms when the temperature drops below 0ｰC: The car windows were covered with frost. seealsoHOARFROST

1 ~ (sth) (over / up) to cover sth or to become covered with a thin white layer of ice: [VN] The mirror was frosted up. * [V] The windows had frosted over. 2 [VN] (especially AmE) to cover a cake with ICING/FROSTING