Meaning

verb lose thickness; become thin or thinner

verb make thin or thinner

verb lessen the strength or flavor of a solution or mixture

originFrom Middle English thinne, thünne, thenne, from Old English þynne, from Proto-West Germanic *þunnī, from Proto-Germanic *þunnuz (“thin”) – compare *þanjaną (“to stretch, spread out”) – from Proto-Indo-European *ténh₂us (“thin”), from *ten- (“to stretch”). Cognate with German dünn, Dutch dun, West Frisian tin, Icelandic þunnur, Danish tynd, Swedish tunn, Latin tenuis, Irish tanaí, Welsh tenau,…

Etymology from Wiktionary, CC BY-SA 3.0