Origin of Expand
Recorded in Middle English since 1422, from Anglo-Norman espaundre, from Latin expandere present active infinitive of expandō (“to spread out”), itself from ex- (“out, outwards”) + pandō (“to spread”).
Middle English expanden to spread out from Latin expandere ex- ex- pandere to spread petə- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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