One way to hold this word: a surface that nothing holds onto. Ice on a path, wet stone, a fish in your hands — it all goes straight past, and there is no moment where anything catches. Now move that same surface into talk. Words that come out with nothing catching have not touched the hard part of the question; a speaker whose talk never catches has never had to stop and think; and if the smoothness is aimed at a listener, it carries them past their own doubts before they can stop either. The picture does not change from meaning to meaning. What changes is who is doing the sliding, and who it costs.
From the word’s history
A shortening of the obsolete English glibbery 'slippery', or of its source, Low German glibberig / Dutch glibberig 'slippery'.
來自舊英文 glibbery（滑溜的）的縮寫，或直接來自它的源頭——低地德語 glibberig、荷蘭語 glibberig，意思都是「滑」。
Wiktionary entry for glib, etymology 1 (packet etymology_text): 'A shortening of either obsolete English glibbery (slippery) or its source, Low German glibberig, glibberich / Dutch glibberig (slippery).'
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