Ablaut of slay, from Middle English slew, sleugh, past of Middle English sleen.
Replaced earlier Middle English slough, slogh, from Old English slōg (past of Old English slēan), due to the influence of knew, drew, etc. More at slay.
Borrowed from Irish slua ("crowd"), from Old Irish slúag, slóg, from Proto-Celtic *slougos ("troop, army"), from Proto-Indo-European *slowgʰos, *slowgos.
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