The term 'in quick succession' can be described by the crossword solutions of 'FAST, ' 'byturns, ' and 'rapidfire.' FAST is an adjective that means moving or able to move with great speed. Byturns is an adverb that means alternately or in turns. Rapidfire is an adjective that means happening or done very quickly, one after another. Together, these words describe a situation where something is happening quickly and in an alternating pattern.