He seemed to think that after that boffo first debate, he could just tread water.
He began to tread water while he tried to lift his head and gaze across the waves.
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.
And Dick had sense enough to take the advice, and tread water quietly till the boat should come.
Some one says: "To tread water is like running up-stairs rapidly."
Then, as St. John turned partly around, he caught him under the arms and began to tread water.
He began to tread water, lifting his mask, then rinsing it because it had fogged a little.
He was full of life, he understood how to swim, to tread water, to turn over and tumble in the flood.
Old English tredan (class V strong verb; past tense træd, past participle treden), from Proto-Germanic *tredanan (cf. Old Frisian treda, Middle Dutch treden, Old High German tretan, German treten, Gothic trudan, Old Norse troða).
early 13c., from tread (v.); in reference to automobile tires, it is recorded from 1906.