leanest

To incline, deviate, or bend, from a vertical position; to be in a position thus inclining or deviating.

“She leaned out of the window.”

To incline in opinion or desire; to conform in conduct; often with to, toward, etc.

“I’m leaning towards voting Conservative in the next election.  The Hispanic vote leans Democratic.”

Followed by against, on, or upon: to rest or rely, for support, comfort, etc.

To hang outwards.

To press against.

To thin out (a fuel-air mixture): to reduce the fuel flow into the mixture so that there is more air or oxygen.

(of a person or animal) Slim; not fleshy.

(of meat) Having little fat.

“lean steak cuts”

Having little extra or little to spare; scanty; meagre.

“a lean budget”

Having a low proportion or concentration of a desired substance or ingredient.

“A lean ore hardly worth mining.”

Of a character which prevents the compositor from earning the usual wages; opposed to fat.

“lean copy, matter, or type”

Efficient, economic, frugal, agile, slimmed-down; pertaining to the modern industrial principles of "lean manufacturing"

“Alcoa is now a lean and agile enterprise, after having split last year into two entities.”

To conceal.