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

To incline, deviate, or bend, from a vertical position; to be in a position thus inclining or deviating. / (copulative) To incline in opinion or desire; to conform in conduct; often with to, toward, etc.

To conceal.

(uncountable) Meat with no fat on it. / (countable, biology) An organism that is lean in stature.

(slang, US) A recreational drug based on codeine-laced promethazine cough syrup, especially popular in the hip hop community in the southeastern United States.

(of a person or animal) Slim; not fleshy. / (of meat) Having little fat. / Having little extra or little to spare; scanty; meagre.

(of an object taller than its width and depth) An inclination away from the vertical.

plural of leaning

Used other than figuratively or idiomatically: see lean, on. / (figuratively) To depend upon for support; to require assistance from.

A tendency or propensity.