an explosive or incendiary device, typically detonated by impact or a timing mechanism and usu dropped from aircraft, thrown or placed by hand, or fired from a mortar
(the bomb) the atom bomb or hydrogen bomb, or nuclear weapons in general
a rounded mass of lava ejected from a volcano
a container for radioactive material, used to treat cancer
a cobalt bomb
Aus, NZ a dilapidated old car
informal a failure or flop
a terrible bomb of a play — Paul Newman
cost a bomb
Brit, informal to be very expensive
go down a bomb
Brit, informal to be received enthusiastically
Our act goes down a bomb in Britain — News of the World
go like a bomb
informal to go very fast
make a bomb
Brit, informal to make a lot of money
[French bombe from Italian bomba, prob via Latin bombus from Greek bombos deep hollow sound, of imitative origin]