It is daydreamed or daydreamt?

Dreamed and dreamt are two spellings of the same verb. They’re both common, depending on the variant of English:

  • Dreamed up is more common in American English.
  • Dreamt up is more common in British English.

In both cases, the other variant of this past-tense verb is also considered acceptable. It’s important to choose one and use it consistently. The QuillBot Grammar Checker can help you with this.