Does anyone know what the literal reference to "slow on the uptake" is and where it originated? I have only ever found similar phrases, but this one. I know its meaning.
Learn English – Origin of “slow on the uptake”
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Best Answer
Uptake (n.) meaning ability to understand is from the beginning of the 19th century. There might be an analogy with the later meaning that refers to a "pipe leading up from the smoke box":
According to Ngram the expressions "slow/quick on the uptake" are both from the early 20th century.