"leak down" is a correct and usable phrase in written English.
It is typically used to describe a situation where something, such as information or a substance, is slowly and gradually spreading or seeping downward. Example: The rumors about the new product launch began to leak down from the company's upper management to the lower-level employees, causing excitement and speculation throughout the office.
If a vessel is to be excused for leaking, she must at least be able to keep the leak down so as not to flood the pumps.
On rare occasions, like watching a sad movie or listening to a sad song, they might leak down my cheeks, but not for long.
If you make one mistake with one element of the project, you'll have a leak down the road.
"We put 156 gallons in the center tank," Mr. Dominguez said, "and it starts to leak down the side.
He spent the first week carrying a water pistol wherever he went, a regular Bogey, but with what looked like bladder issues: "I dropped it, and a piece broke off, and I'd put it in my pocket and have this big leak down my leg".
Sometimes, when the first pangs of rusty saliva leak down my throat, I like to pretend that I'm an angry dragon, hurriedly flapping my wings to spray an unsuspecting porcelain city with waves of bilious puke-fire.
"I was protesting because this water is leaking down," he said, adding, "We are severely sick and tired".
But it had to move to the New Theater when water began leaking down on actors and the audi ence from the hotel floors above.
He spied a corrugated culvert pipe, off to the left, through which water was leaking down into a creek — the Assunpink Creek, he presumed — and he decided to have a little fun, paddling into the rusty chute.
The dry clay helps hold an earth wall together, but if the wall is directly exposed to rain, or to water leaking down from the roof, it may become saturated and collapse.
She says the leaked Downing Street memo proved that.
