Answer: catchon

AnswerCrossword Clue
CATCHON

Become popular

CATCHON

Gain in popularity

CATCHON

Understand finally

CATCHON
Understand
CATCHONUnderstand.
CATCHON
Become popular.
CATCHONGet the idea
CATCHONGrasp, as a joke
CATCHONGet the picture
CATCHONGrow in popularity
CATCHONTake root