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.
One who has control or dominance.
A husband, especially one who is domineering.
Used other than figuratively or idiomatically: see lord, master.