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English definition of “lean”

lean

verb [I or T, usually + adv/prep] uk   /liːn/ (leaned or UK also leant, leaned or UK also leant) us  
B2 to (cause to) slope in one direction, or to move the top part of the body in a particular direction: She leaned forward and whispered something in my ear. I sat down next to Bernard, who leaned over to me and said "You're late." Lean your head back a bit. That fence is leaning to the right.

lean

adjective uk   /liːn/ us  

lean adjective (NO FAT)

describes meat that has little fat thin and healthy: lean and fit

lean adjective (NOT ENOUGH)

If a period of time is lean, there is not enough of something, especially money or food, at that time: It has been a particularly lean year for the education department.

lean adjective (EFFICIENT)

approving A lean company or organization uses only a small number of people and a small amount of money, etc. so that there is no waste: Nowadays even efficient, lean, well-run industries are failing.
(Definition of lean from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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