aboveboard → ants pants
above board (honest and legal): If we do everything above board, we will have to pay tax on your earnings.
air one’s dirty laundry in public (discuss personal problems in public): I don’t want to air our dirty laundry in public.
all along (all the time): Do you think she has been cheating us all along?
an arm and a leg (a huge amount of money): This car cost me an arm and a leg.
ants in one’s pants (to be restless or unable to sit still):