Definition of "lean"
verb:
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To hang outwards.
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To press against.
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To thin out (a fuel-air mixture): to reduce the fuel flow into the mixture so that there is more air or oxygen.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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adjective:
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Slim; not fleshy.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
Having little fat.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
Having little extra or little to spare.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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