instrumental word-forming element, expressing "appliance, tool," from Old English -ol, -ul, -el, representing PIE *-lo- (see -ule). In modern English usually -le except after -n-. As in treadle, ladle, thimble, handle, spindle, girdle; also compare dialectal thrashle "flail, implement for thrashing," from Old English ðerscel, Middle English scrapel "instrument for scraping" (mid-14c.), etc.
diminutive suffix (though in Modern English not always perceived as such), from Old French -el (fem. -elle, Modern French -el, -eau), from Latin -ellus, -ella, -ellum, diminutive suffix, from PIE *-olo-lo-, itself a double diminutive, from *-lo- (see -ule).
derivational suffix, also -le, used mostly with verbs but originally also with nouns, "often denoting diminutive, repetitive, or intensive actions or events" [The Middle English Compendium], from Old English. Compare brastlian alongside berstan (see burst); nestlian (see nestle) alongside nistan). It is likely also in wrestle, trample, draggle, struggle, twinkle, also noddle "to make frequent nods" (1733). New formations in Middle English might be native formations (jostle from joust) with this or borrowings from Dutch.