The most important one out of a related group.
The ship occupied by the fleet's commander (usually an admiral); it denotes this by flying his flag.
The ship regarded as most important out of a group, e.g. a nation's navy or company's fleet.
To act as a flagship for.
An important, powerful or influential person.
A self-important or pretentious person.
A massive, rocket-propelled, explosive-laden cart designed by the British military during World War II.