The verb is from side + -le (frequentative suffix), possibly a back-formation from sideling (“in a sidelong direction; askew, obliquely”, adverb), treating that word as the present participle of sidle. The noun is derived from the verb.
Popraw swoją wymowę
Ćwicz mówienie i zapamiętywanie " sidle " i wielu innych słów i zdań z angielski .