up‧take /ˈʌpteɪk/ noun
[Sense 1: Date: 1800-1900; Language: Scottish English; Origin: uptake 'to understand' (18-20 centuries). ]
[Sense 2-3: Date: 1900-2000; Origin: up + take]

1. be slow/quick on the uptake informal to be slow or fast at understanding something

2. [singular] the number of people who use a service or accept something that is offered:
The uptake of some vaccinations fell as the media stirred up fears of possible side effects.

3. [uncountable and countable] the rate at which a substance is taken into the body, a system etc:
the uptake of sugars by the blood

[TahlilGaran] Dictionary of Contemporary English ▲