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The four-letter word that built billion-dollar empires out of a thumbs-up.

means To find something agreeable or pleasantor, as a particle, the all-purpose verbal filler and quotation marker that peppers casual speech ('I was, like, done').

from From Old English 'lician,' meaning to please or be pleasing, rooted in a Germanic family (cousin to Dutch 'lijken' and German 'gleichen,' to resemble). The 'similar to' sense comes from a related Old English word 'gelic,' meaning 'having the same form' — literally 'with-the-body,' from 'lic,' body, the same 'lic' hiding in 'corpse' words across Germanic tongues. So the verb you do with a thumb and the word you use to compare things were once near-siblings, both circling the idea of 'matching' or 'suiting.' The modern filler-and-quotation 'like' is a 20th-century colloquial blossoming of the comparison sense.

thumb originsFacebook's button almost shipped as Awesome instead
verbal ticValley girls weaponized it into a sentence pause
old EnglishOnce meant body, as in lich and corpse
dopamine engineNotifications hijack the same reward circuit as slot machines
simile fuelPowers nearly every poetic comparison ever written
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