Entry
  1. Adverb (fukushi), Adverb taking the 'to' particle, Suru verb

    drowsily; nodding off

    Onomatopoeic or mimetic word

    昨日あまり寝る時間がなかったので、会社に来てから一日中うつらうつらしていた。
    I didn't get much sleep last night so I was nodding off all day at work.

Also written ウツラウツラ

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