hand over fist
/ˌhand əʊvə ˈfɪst/informal (originally US )
adverb
1Originally and chiefly Nautical. With rapid and continual advances.
- Frequently in to come up hand over fist..
2Rapidly and continuously; in abundance.
- Frequently with reference to the making or losing of money..
3With each hand brought successively over the other.
Origin
Early 19th century. From hand + over + fist. Compare earlier hand over hand.