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daydream (EN)
verb, noun

verb “daydream”

infinitive daydream; he daydreams; past tense daydreamed, daydreamt; past part. daydreamed, daydreamt; ger. daydreaming
  1. to engage in the activity of having a stream of unrelated thoughts while awake
    During the long lecture, Sarah daydreamed about her upcoming vacation to the beach.

noun “daydream”

singular daydream, plural daydreams
  1. a stream of thoughts that occur when one is awake not related to what is currently happening
    During the boring lecture, Sarah slipped into a daydream about her upcoming beach vacation.