Noun
(colloquial) An aircraft used to destroy dams by dropping bombs on them.
(colloquial) The pilot of this kind of aircraft.
(by extension) An aircraft and pilot involved in Operation Chastise (1943).
Source: en.wiktionary.orgJohnny Johnson, 96 — the last surviving British Dambuster — was among ten RAF veterans who took part in a ceremony to break the ground where the sculpture will be installed at Brills Farm, on the border of Lincolnshire and Nottinghamshire. Source: Internet