Meaning of “lean (sth) against/on sth” - Learner’s Dictionary

lean (sth) against/on sth

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

B2 to sit or stand with part of your body touching something as a support:

He leaned against the wall.
She leaned her head on his shoulder.

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