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pitch in 
1 chip in  (informal) contribute, cooperate, do one's bit, help, join in, lend a hand, lend a helping hand, participate 
2 begin, fall to, get busy, get cracking  (informal) plunge into, set about, set to, tackle 

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"