To change (something) from a smaller form or size to a larger one; to spread out or lay open.
You can expand this compact umbrella to cover a large table.
Recorded in Middle English since 1422 (as expanden, expaunden), from Anglo-Norman espaundre, from Latin expandere (“to spread out”), itself from ex- (“out, outwards”) + pandō (“to spread”). Doublet of...
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To increase the extent, number, volume or scope of (something).
A flower expands its leaves.
To express (something) at length and/or in detail.