From Middle English thombe, thoume, thoumbe, from Old English þūma, from Proto-Germanic *þūmô (compare West Frisian tomme, Dutch duim, Low German Duum, German Daumen, Danish tomme, Swedish tumme), from Proto-Indo-European *tūm- ("to grow") (compare Welsh tyfu ("to grow"), Latin tumēre ("to swell"), Lithuanian tumėti ("to thicken, clot"), Ancient Greek τύμβος ("burial mound"), Avestan 𐬀𐬨𐬏𐬙, Sanskrit तुम्र ("strong, thick")). The parasitic ‐b has existed since the late 13th century.
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