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fits and starts, by

fits and starts, by idiom

Also, in fits and starts. With irregular intervals of action and inaction, spasmodically, as in The campaign is proceeding by fits and starts. This expression began in the late 1500s as by fits, the noun fit meaning a “paroxysm” or “seizure”; starts was added about a century later.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.