Occasionally or from time to time, but not regularly or frequently.
This phrase emerged in the early 19th century as a variation of the older 'now and then.' The repetition of 'now' emphasizes the irregular, sporadic nature of the occurrence. It reflects the English tendency to use redundant phrasing for emphasis.
The phrase creates a rhythmic, almost musical quality through its repetition, which makes it more memorable than simple alternatives like 'occasionally.' Interestingly, it's one of many English expressions that use time words redundantly for effect, similar to 'again and again' or 'over and over.'
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