to overcome completely in mind or feeling: overwhelmed by remorse.
to overpower or overcome, esp. with superior forces; destroy; crush: Roman troops were overwhelmed by barbarians.
to cover or bury beneath a mass of something, as floodwaters, debris, or an avalanche; submerge: Lava from erupting Vesuvius overwhelmed the city of Pompeii.
to load, heap, treat, or address with an overpowering or excessive amount of anything: a child overwhelmed with presents; to overwhelm someone with questions.