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Increase suddenly and significantly (4)

Solution has appeared in 2 crosswords (1 across and 1 down):

• Quick crossword No 16,129 — 2022-01-17 00:00:04
  17D: Leap (4)
• Quick crossword No 15,679 — 2020-08-06 23:00:21
  7A: Increase suddenly and significantly (4)