Princeton's WordNet

1. overwhelm, overpower, sweep over, whelm, overcome, overtake(verb)

   overcome, as with emotions or perceptual stimuli

2. overwhelm, deluge, flood out(verb)

   charge someone with too many tasks

3. submerge, drown, overwhelm(verb)

   cover completely or make imperceptible

   "I was drowned in work"; "The noise drowned out her speech"

4. overpower, overmaster, overwhelm(verb)

   overcome by superior force

Kernerman English Learner's Dictionary

1. overwhelm(verb)ˌoʊ vərˈʰwɛlm, -ˈwɛlm

   to make sb feel very strong emotions that are difficult to deal with

   parents overwhelmed with grief after the death of their daughter; The beauty of the landscape overwhelmed her.

2. overwhelmˌoʊ vərˈʰwɛlm, -ˈwɛlm

   to give sb so much of sth that it is difficult to deal with

   students overwhelmed by the huge amounts of information

Wiktionary

1. overwhelm(Verb)

   To engulf, surge-over and submerge

   The dinghy was overwhelmed by the great wave.

2. overwhelm(Verb)

   To overpower, crush

   In December 1939 the Soviet Union attacked Finland with overwhelming force.

3. overwhelm(Verb)

   To overpower emotionally

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