used when telling a horse to stop

"Whoa there, Poppy," he said to his pony, and stopped beside the kerb. “吁，波皮。”他向自己的小马喝道，扯扯缰绳停在路边。

used when telling a person to stop what they are doing or to do it more slowly

Yes, carrots please. Whoa! That's plenty.

Whoah, whoah, everybody needs to relax.

A sign posted at their house reads: " Woa. Visitors Turn Back."