Definition of slow on the uptake
- Being slow on the uptake, I didn't realize what was going on at first.
: mentally dull : stupid
: naturally inert or sluggish
: lacking in readiness, promptness, or willingness
: to make slow or slower : slacken the speed of
: to go or become slower
: understanding, comprehension
: a flue leading upward
: an act or instance of absorbing and incorporating especially into a living organism, tissue, or cell
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