Catch or latch follower (4)
I believe the answer is:
onto
(Other definitions for onto that I've seen before include "forward, with a destination" , "Rumbling" , "Small Scottish farm" , "To a position on (something)" , "(Moving) aboard" .)
I believe the answer is:
onto
(Other definitions for onto that I've seen before include "forward, with a destination" , "Rumbling" , "Small Scottish farm" , "To a position on (something)" , "(Moving) aboard" .)