
By/in fits and starts
Not Consistent
Indicates something doesn’t happen in a regular pattern or at evenly spaced times.

Her attendance at the gym was by fits and starts, lacking consistency.
Expect Delays
Suggests there could be interruptions or pauses in the process or action.

Learning a new language happens in fits and starts, so don't get discouraged.
Implying Frustration
Can imply that the lack of steadiness is causing annoyance or inconvenience.

The team's efforts to complete the project moved by fits and starts, testing everyone's patience.
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