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ムッと (Mutto) is a Japanese suru verb meaning “to be offended, to get angry, to be annoyed, to be miffed”.

Meanings

  1. suru verb, intransitive verb, adverbto be offended; to get angry; to be annoyed; to be miffed; to be huffy; to be sullen
  2. suru verb, intransitive verb, adverbto be stuffy; to be stifling; to be muggy
  3. adverbfirmly (shutting one's mouth)