fits and starts
To do something in “fits and starts” is to do it intermittently or sporadically: “Martina has been working on her master's thesis in fits and starts; she needs to work on it consistently.”
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The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.