shell

shell 1

•  noun [C]

1   
a) the hard outside part of a nut, egg, or seed
b) the hard outside part that covers some animals, for example SNAILs and CRABs:
?The turtle put its head into its shell.

2    a metal container filled with explosive material, which is fired from a large gun


shell 2

• verb [T]

to fire shells at something
shell out phrasal verb [T] informal
to pay a lot of money for something