Etymology
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sidle (v.)

"to move or go sideways," 1690s, back-formation from obsolete Middle English sidlyng (adv.) "obliquely, sideways; aslant; laterally" (early 14c., perhaps in Old English), from side (n.) + adverbial suffix -ling; altered on analogy of verbs ending in -le. Related: Sidled; sidling. Old English had sidlingweg (n.) "sidelong-way, oblique road."

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Definitions of sidle

sidle (v.)
move unobtrusively or furtively;
The young man began to sidle near the pretty girl sitting on the log
sidle (v.)
move sideways;
Synonyms: sashay
From wordnet.princeton.edu