Expatiate means ‘to enlarge in discourse or writing; be copious in description or discussion.’ For example, to expatiate upon a theme. The verb comes from the Latin expatiatus ‘to move, run, or flow away beyond bounds, spread out.”, and even further back, it comes from the Latin spatiari ‘to walk about leisurely, stroll.’. You can probably see the root word of ‘space’ here, because the root of spatiari is spatium, or ‘an explanse of ground, area, or space. Expatiate, although new to me, has been around in English since the 16th century.
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