v. t. [ Cf. G. klümpern to clod. See Clump, n. ] To form into clumps or masses. [ Obs. ] [ 1913 Webster ]
Vapors . . . clumpered in balls of clouds. Dr. H. More. [ 1913 Webster ]
n. A game in which questions are asked for the purpose of enabling the questioners to discover a word or thing previously selected by two persons who answer the questions; -- so called because the players take sides in two “clumps” or groups, the “clump” which guesses the word winning the game. [ 1913 Webster ]