leanest

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

   She leaned out of the window.

2. 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.

3. Followed by against, on, or upon: to rest or rely, for support, comfort, etc.
4. To hang outwards.
5. To press against.

verb

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

1. (of a person or animal) Slim; not fleshy.
2. (of meat) Having little fat.

   lean steak cuts

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

   a lean budget

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

   A lean ore hardly worth mining.

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

   lean copy, matter, or type

6. 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.

verb

To conceal.