The rules are enforced in the game by the umpires who blow whistles when a penalty occurs.

She has also seen executives blow whistles and use stopwatches.

They blow whistles whenever tourists try to wade into the basin.

Blowing whistles and shouting imprecations from a hundred yards away.

At halftime, the public address announcer asked fans to refrain from blowing whistles.

Only the old steam engines blew whistles, and the last one was retired thirty years ago.

Fish pursed his lips for a moment and blew short silent whistles through them.

He heard nothing except Hugh's singing, however, not even the sound of blowing whistles.

Suddenly rioters appeared at the top, blowing whistles and throwing bottles.

Policemen in white gloves are directing people and blowing whistles.

He ducked just in time to feel the rush of air as a powerful blow whistled past his ear.

A blow whistled through the air near his left ear but he was already rolling away from it.

The blow whistled past, with little room to spare.

The blow whistled past Picard's ear.

Poffis, however, recovered with miraculous speed, moved aside as the blow whistled past and smashed the patient on the jaw.

And the blow whistled harmlessly through the air, for the Rider had used a simple feint to dodge the prince.

She threw herself aside, and the blow whistled through empty air as she tumbled to the ground cloth.

Rod leaped back, letting the blow whistle past him, then lunged over it with a chop.