Speaking fluently and readily but often insincerely or superficially.
Originally from Middle Low German 'glibberich' meaning slippery or smooth. The word evolved from describing physical slipperiness to characterizing smooth but potentially deceptive speech patterns.
The connection between physical slipperiness and deceptive speech is brilliantly intuitive - both involve surfaces that can't be trusted for grip! Politicians and salespeople are often described as glib, suggesting their words might slip away from truth as easily as feet slip on ice.
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