To cause the liquid in something to flow out, leaving it empty or dry. She drained the pasta before adding the sauce.
To deplete or exhaust resources, energy, or vitality. The long meeting drained all of his energy.
To gradually remove or reduce something, especially over time. The project drained their financial resources.
Of a liquid: to flow away or out of something. After the storm, the floodwater slowly drained away.
To drink the contents of something until it is empty. He drained his coffee cup in one gulp.