Other forms: leaning, leaned, leans
To lean is to tip your body out of upright, nearly always against something that will take your weight. You lean on a fence to watch the match, lean over the table to see the map, lean back until the chair complains.
Objects lean as well: a ladder leans against a wall, and the tower at Pisa leans and does very little else. Lean ON somebody means rely on them — or, harder, put pressure on them until they agree. Lean TOWARDS means half-prefer: I'm leaning towards the blue one. There is a separate adjective spelled the same and worth keeping apart: lean meat has little fat, a lean year is a poor one, and a lean company has had everything spare cut out of it. The past tense is leaned in American English and often leant in British, both sounding like lent.
1verbtiltTo bend or tip your body away from upright.
“She leaned over the counter to read the small print.”
2verbleanTo rest against something, or to rest something against a support.
“He leaned his bike against the wall and went inside.”
3verbdependTo depend on somebody for help.
“She leaned on her sister badly that winter.”
4verbfavourTo favour one option or opinion slightly.
“The committee is leaning towards the cheaper design.”
5adjectivefatHaving little or no fat.
“Buy the lean mince, not the cheap one.”
6adjectivemeagrePoor, thin in resources, producing little.
“They got through some lean years before the shop turned a profit.”
Too few real examples of this word to estimate which sense is commonest.
Lean comes straight down the Germanic line: Old English hleonian, "to lean, recline, rest", from Proto-Germanic hlināną, "to lean, incline", and behind that the Proto-Indo-European root ḱley-. That root travelled into other branches too, which is why climate and cline are distant cousins of this very ordinary verb. German lehnen is the same word, still leaning.
Proto-Indo-European
*ḱley-
Proto-Germanic
*hlināną — to lean, incline
Proto-West Germanic
*hlinēn
Old English
hleonian
Middle English
lenen — to lean
English, today
lean
Built from
From Middle English lenen (“to lean”), from Old English hleonian, hlinian (“to lean, recline, lie down, rest”), from Proto-West Germanic hlinēn, from Proto-Germanic hlināną (“to lean, incline”), from Proto-Indo-European ḱley-. Cognate via Proto-Germanic with Middle Dutch leunen (“to lean”), German lehnen (“to lean”); via Proto-Indo-European with climate, cline.
Etymology from Wiktionary, CC BY-SA