Bloc

google

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early 20th century: from French, literally ‘block’.

wiktionary

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Borrowed from French bloc(“group, block”), ultimately of Old Dutch origin, from Frankish or Proto-West Germanic *blokk, from Proto-Germanic *blukką(“beam, log”). Doublet of block.

etymonline

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bloc (n.)

1903, in reference to alliances in Continental politics, from French bloc "group, block," from Old French bloc "piece of wood" (see block (n.1)).