Third person singular form of astound; to surprise or shock someone greatly.
From Old French 'astoner' (to stun), possibly from Latin 'ex-' (out) plus 'tonare' (to thunder), originally meaning to strike as forcefully as thunder.
The word 'astound' literally meant to stun you like a thunderbolt—that's why it still carries such dramatic weight when we say something 'astounds' us today!
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