The term 'again and again' can be expressed in a variety of ways. The crossword solutions for this term include 'thrice' (6 letters), 'OFTEN' (5 letters), 'TREBLY' (6 letters), 'TRIPLY' (6 letters), and 'THREEFOLD' (9 letters). 'Thrice' is an adverb meaning three times, while 'OFTEN' is an adverb meaning frequently. 'TREBLY' is an adverb meaning three times as much, and 'TRIPLY' is an adverb meaning three times over. Finally, 'THREEFOLD' is an adjective meaning three times as great or as many. All of these words express the idea of something happening multiple times, which is the definition of the phrase 'again and again'.