Think of swallowing, and then swallowing past the point where there is room. That is what sits under this word: the source traces it to a Latin verb meaning to swallow, the same line as glutton. Fill an appetite until nothing more will go in, and you have the oldest use. Change the mouth into a market and pour goods in until the market cannot take another crate, and you have the verb. What is then left standing there unsold is the noun, a glut. So the word never means simply 'a lot'. It means 'more than can be swallowed'.
From the word’s history
The source derives the word from Latin gluttire, to swallow, by way of Old French, and compares French glouton, a glutton. The swallowing is therefore the picture, not a guess.
來源說這個字經由古法文來自拉丁文 gluttiō / gluttīre（吞下去），並且拿法文 glouton（貪吃的人）作對照。所以「吞」這個畫面是來源給的，不是後來補上去的聯想。
Wiktionary via kaikki (source_ref kaikki:3f6f69a190036ae4:403715881:21738): "Inherited from Middle English glotien/glotten, probably derived from Old French gloter … derived from Latin gluttiō, gluttīre ('to swallow'). Compare French glouton ('glutton')."
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