1690s, from Middle English sidlyng (early 14th century), as side + -lyng (“(frequentive)”) (modern English side + -le (“(frequentive)”)).
sidle (plural sidles)
- A sideways movement.
- A furtive advance.
sidle (third-person singular simple present sidles, present participle sidling, simple past and past participle sidled)
- To move sideways.
- To advance in a furtive, coy or unobtrusive manner.
- 1960, P. G. Wodehouse, Jeeves in the Offing, chapter VIII:
- At an early point in these exchanges I had started to sidle to the door, and I now sidled through it, rather like a diffident crab on some sandy beach trying to avoid the attentions of a child with a spade.
To advance in a furtive, coy or unobtrusive manner
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See also 
- ^ “sidle” in Douglas Harper, Online Etymology Dictionary (2001).