Related Clues:
- Yes, gruffly
- Yup
- Owl howl
- Exclamation of impatience
- Owl's cry
- With 40-Across, nocturnal noisemaker
- Call heard at night
- Oft-repeated word in "Fargo"
- Feline whistle of disapproval
- Not the sound of a bird by 17 across
- What you might not give for the owl, and the owl would always give
- Miaow!
- Miaow in derison
- Not the sort of thing a bull would do with its horn, by the sound of it
- The horned owl, by the sound of it