SUCK

Use lips and mouth to create a partial vacuum (4)

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

• Quick crossword No 16,131 — 2022-01-19 00:00:05
  10A: Use a straw? (4)
• Quick crossword No 15,522 — 2020-02-06 00:00:24
  3D: Use lips and mouth to create a partial vacuum (4)