I mean the phrase when I tell you it, btw

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Across
  1. 1. To conceptualize inside one's head
  2. 3. Can often be found on road signs indicating the road moving in one direction
  3. 5. To reference someone else, a letter in the alphabet
  4. 6. Often confused with its homonyms, a letter and a number
  5. 8. To question something
  6. 9. In attempt to do something
Down
  1. 2. A thought in your head, plural
  2. 4. Synonymous to approximately
  3. 7. Where house cats always want to be
  4. 8. To refer to all options
  5. 10. Contraction of I and am