Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
uptake [ˈʌpteɪk] n
to be quick/slow on the uptake бы́стро/ме́дленно сообража́ть (impf)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: