She tends to expatiate on her travels for hours.The professor can expatiate on this topic endlessly.He will expatiate at length during the presentation.
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Expiate
/ˈekspieɪt/
To make amends or show remorse for a wrongdoing or guilt.
Examples:
He donated to charity to expiate his past misdeeds.In her mind, volunteering was a way to expiate former selfishness.She hoped the gesture would expiate her earlier harsh words.
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Ways to tell them apart:
Remember that expatiate is related to expansion and speech, while expiate is tied to the concept of making amends or atonement.
Expatiate contains an a, just like in talk, which it often involves doing.
Expiate involves the pi sound, think of penance, which it often refers to.