Happy Birthday, Dad

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Across
  1. 4. Counterpart of wife
  2. 6. ER visitor
  3. 7. Retiree activity
  4. 10. Batman to Gotham City
  5. 11. Worst part of April
  6. 15. Adoring
  7. 17. Well-versed
  8. 18. Office attire
  9. 19. A hint to the rest of this puzzle?
  10. 20. After a muddy drive
  11. 22. Paying mind to
  12. 23. Chinese martial art
  13. 25. Six rings
  14. 27. Zodiac sign associated with perfectionism
  15. 29. Predecessor to the iPhone
  16. 33. Gives a hoot
  17. 34. Hammers and Drills
  18. 35. "It's not the heat, it's the __"
  19. 36. Old ETs
  20. 38. "__ Of the Carribbean"
  21. 39. Reslate
  22. 40. Kind
  23. 41. 70's pants
Down
  1. 1. Repairs dents
  2. 2. Trusty coat
  3. 3. Two weeks after the last frost
  4. 5. Tuesdays in the summer
  5. 8. Every week, when the grass is dry
  6. 9. Job for your children
  7. 12. Prodigal __
  8. 13. Like a phone case
  9. 14. Second weekend of December
  10. 16. Outdoor cooking
  11. 19. Not a sister
  12. 21. Daytime snooze
  13. 24. My dad loves the ___ Channel
  14. 26. A coach to his team
  15. 28. Gentle
  16. 30. "Why need GPS?"
  17. 31. Like a new parent
  18. 32. "__ Buck"
  19. 33. Every 5,000 miles
  20. 37. Dad's dad
  21. 38. Artic flappers