like merry hell

English edit

(colloquial) With great vigour.
- 2003, Maxwell Steer, Music and Mysticism: Parts 3 and 4, page 11:
  But basically the classical musicians kept their eyes glued to their parts and played like merry hell, and the drummer kept his eyes glued on the conductor drummed like merry hell whenever he was cued—but there was no emotional unity […]
- 2015, Jonathan Peace, The Bloodstone Of Cerillion, page 51:
  They saw us and ran for it like merry hell, trying to get there and plunder it before we could raise the alarm.