We have no meanings for "mournful hoot" in our records yet.
1 From far down the canyon came the mournful hoot of an owl.
2 From the distant forest came the mournful hoot of an owl.
3 A large white owl swooped across the clearing, greeting them with a mournful hoot .
4 Presently came the mournful hoot of an owl from the live oaks over in the pasture.
5 The mournful hoot of a distant locomotive whistle was the only sound to pierce the silence.
6 The world waits, and the only sound is a low, mournful hoot from some fogbound boat on the river.
7 The Accursed Thing emitted a mournful hoot , as Binks, hearing his name spoken, raised his head and looked up at his master.
8 An owl sounded a series of mournful hoots .
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