Do not exhaust yourself; keep your hands quiet and tread water.
His boots, too, were acting as a drag, yet there was no time to tread water and kick them off.
At first it was easy to tread water: the salt brine upheld him.
Some one says: "To tread water is like running up-stairs rapidly."
He began to tread water, lifting his mask, then rinsing it because it had fogged a little.
Then, as St. John turned partly around, he caught him under the arms and began to tread water.
She could stay below as long as Ole; she could dive, and tread water, and swim backwards.
And Dick had sense enough to take the advice, and tread water quietly till the boat should come.
He began to tread water while he tried to lift his head and gaze across the waves.
Margery, seized by a panic, forgot to tread water and went clear to the bottom.