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this is why is not in our dictionary (yet). Here's what it could mean:

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idiomatic phrase

  • A phrase used to introduce the reason or explanation for a previously mentioned event, statement, or situation.

Example Sentences

Examples are provided to illustrate usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“And this is why I voted for you, because I know you’re going to do something about it,” Anglada told Pratt as he handed back her phone.

From Los Angeles Times • May 21, 2026

"And this is why this film exists and why I exist as an artist because of those people right there," he added, motioning to his family and crew.

From Barron's • May 15, 2026

Thesaurus

Possible Synonyms

Words in our thesaurus

other words

  • exhibit A
  • and that explains it
  • and that's the tea
  • the math is mathing

Possible Antonyms

Words in our thesaurus

other words

  • for no reason at all
  • plot twist
  • despite that
  • in spite of this
  • but whatever

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