(~s)
1.
A ~ is a large gun, usually on wheels, which used to be used in battles.
N-COUNT
2.
A ~ is a heavy automatic gun, especially one that is fired from an aircraft.
N-COUNT
3.
If someone is a loose ~, they do whatever they want and nobody can predict what they are going to do.
Max is a loose ~ politically.
PHRASE: usu v-link PHR
see also water ~