Etymology
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lean (v.)

c. 1200, from Old English hlinian "to recline, lie down, rest; bend or incline" (Mercian hleonian, Northumbrian hlionian), from Proto-Germanic *hlinen (source also of Old Saxon hlinon, Old Frisian lena, Middle Dutch lenen, Dutch leunen, Old High German hlinen, German lehnen "to lean"), from PIE root *klei- "to lean."

Transitive sense "cause to lean or rest" is from 14c. Meaning "to incline the body against something for support" is mid-13c. Figurative sense of "to trust for support" is from early 13c. Sense of "to lean toward mentally, to favor" is from late 14c. Related: Leaned; leaning. Colloquial lean on "put pressure on" (someone) is first recorded 1960.

lean (adj.)

"thin, spare, with little flesh or fat," c. 1200, from Old English hlæne "lean, thin," possibly (Skeat) from hlænan "cause to lean or bend," from Proto-Germanic *khlainijan, which would connect it to Old English hleonian (see lean (v.)). But perhaps rather, according to OED, from a PIE *qloinio- (with cognates in Lithuanian klynas "scrap, fragment," Lettish kleins "feeble"). Extended and figurative senses from early 14c. In business jargon, paired with mean (adj.) from 1970s to suggest aggressiveness as if from hunger.

lean (n.1)

"action or state of leaning, deviation from a vertical position," 1776, from lean (v.).

lean (n.2)

c. 1200, "lean animals or persons," from lean (adj.). Meaning "lean part of anything, muscle without fat, lean meat" is mid-15c.

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Definitions of lean
1
lean (v.)
to incline or bend from a vertical position;
She leaned over the banister
Synonyms: tilt / tip / slant / angle
lean (v.)
cause to lean or incline;
He leaned his rifle against the wall
lean (v.)
have a tendency or disposition to do or be something; be inclined;
Synonyms: tend / be given / incline / run
lean (v.)
rely on for support;
We can lean on this man
lean (v.)
cause to lean to the side;
Synonyms: list
2
lean (adj.)
lacking in mineral content or combustible material;
lean fuel
lean ore
lean (adj.)
containing little excess;
a lean budget
Synonyms: skimpy
lean (adj.)
not profitable or prosperous;
a lean year
lean (adj.)
lacking excess flesh; "Yon Cassius has a lean and hungry look"-Shakespeare;
Synonyms: thin
3
lean (n.)
the property possessed by a line or surface that departs from the vertical;
Synonyms: tilt / list / inclination / leaning
From wordnet.princeton.edu