He is whistling merrily.
A sound produced by a whistling device or by whistling through the lips.
Learn tolerance; learned how to whistle.
I wish you' d leave off whistling like that.
He called his dog with a loud whistle.
The farmer whistled as he milked.
The little boy rounded his lips to whistle.
He throws back his head; stretches out his legs; and begins to whistle.
He cloaked his fear by whistling and pretending to be unafraid
He cloaked his fear by whistling and pretending to be unafraid.