Definition of “lean sth against/on sth” - Learner’s Dictionary

lean sth against/on sth

phrasal verb with lean us uk /liːn/ verb past tense and past participle leaned, also UK leant /lent/

B2 to put something against a wall or other surface so that it is supported:

Lean the ladder against the wall.

(Definition of “lean sth against/on sth phrasal verb, verb” from the Cambridge Learner's Dictionary © Cambridge University Press)