PUT A BUG IN YOUR EAR - "put a bug (or flea) in (someone’s) ear, put a bug (or bee) in (someone’s) bonnet, to suggest, hint, reveal, around 1900. This seems to be a later version of to earwig."
earwig - pester, insinuate, influence with words, from the earwig insect (first recorded in English in 1000), which was thought to enter the head through the ear." From "Listening to America" by Stuart Berg Flexner (Simon and Schuster, New York, 1982).
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A phrase I used just yesterday…
-Tim
