"Hold ___ your butts!" (4)
I believe the answer is:
onto
(Other definitions for onto that I've seen before include "To a place on" , "(Moving) aboard" , "forward, with a destination" , "To a position on (something)" , "Rumbling" .)
I believe the answer is:
onto
(Other definitions for onto that I've seen before include "To a place on" , "(Moving) aboard" , "forward, with a destination" , "To a position on (something)" , "Rumbling" .)