1. To incline, deviate, or bend, from a vertical position; to be in a position thus inclining or deviating.
  2. To incline in opinion or desire; to conform in conduct; with to, toward, etc.
  3. To rest or rely, for support, comfort, etc.; with on, upon, or against.
  4. To hang outwards.
  5. To press against.

Verb (etymology 2)

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

Verb (etymology 3)

  1. To conceal.


  1. slim; not fleshy.
  2. having little fat.
  3. Having little extra or little to spare; scanty; meagre.
    a lean budget; a lean harvest
  4. Of a fuel-air mixture, having more air than is necessary to burn all of the fuel; more air- or oxygen- rich than necessary for a stoichiometric reaction.
  5. Of a character which prevents the compositor from earning the usual wages; opposed to .
    lean copy, matter, or type

The above text is a snippet from Wiktionary: lean
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