Definition of lean verb from the Oxford Advanced American Dictionary

      

    lean

     verb
    verb
    NAmE//lin//
     
    Verb Forms present simple I / you / we / they lean
     
    he / she / it leans
     
    past simple leaned
     
    (British English also) past simple leant
     
    -ing form leaning
     
     
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  1. 1[intransitive] (+ adv./prep.) to bend or move from a vertical position I leaned back in my chair. The tower is leaning dangerously. A man was leaning out of the window.
  2. 2[intransitive] to rest on or against something for support lean against something A shovel was leaning against the wall. lean on something She walked slowly, leaning on her son's arm.
  3. 3[transitive] lean something against/on something to make something rest against something in a sloping position Can I lean my bike against the wall?
  4. Idioms
    bend/lean over backward (to do something)
     
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    to make a great effort, especially in order to be helpful or fair I've bent over backward to help him.
    Phrasal Verbslean on somebody/somethinglean to/toward something
See the Oxford Advanced Learner's Dictionary entry: lean