to settle a matter by leaving it unresolved; to let a problem end up with no definite result or action; to leave a difficult situation as-yet-unfinished task aside and simply ignore it

To not quite understand something or not be very clear about a situation; usually used for things one is only vaguely aware of.

to be clever and quick-witted in childhood

A proverb meaning that being bright and clever at an early age does not necessarily lead to achievement when growing up.