a large bin or receptacle; a fixed chest or box

a coal bunker.

a fortification set mostly below the surface of the ground with overhead protection provided by logs and earth or by concrete and fitted with openings through which guns may be fired.

Golf . any obstacle, as a sand trap or mound of dirt, constituting a hazard.

Nautical .

to provide fuel for (a vessel).

to convey (bulk cargo except grain) from a vessel to an adjacent storehouse.

Golf . to hit (a ball) into a bunker.

to equip with or as if with bunkers

to bunker an army's defenses.

noun

shelter , dugout , fortification , blockhouse , sand trap , trap , sand bunker , army , bin , crib , hold , receptacle