The phrase 'しなだれかかる' can be beautifully translated as 'to lean languidly' or 'to drape oneself'. It captures that effortless, graceful weight of leaning against something with full relaxation. In cinema, this motion often conveys intimacy or exhaustion - think of Scarlett Johansson's character draping over the piano in 'Lost in Translation', her body melting into the instrument with urban loneliness.
Another striking example is the famous bench scene in 'Forrest Gump', where Jenny's weary posture against Forrest speaks volumes about their emotional history. The way fabric folds, how shoulders slope - filmmakers use these subtle physical details to show vulnerability without dialogue. English tends to favor more active verbs, but 'slumping against' or 'sprawling on' sometimes misses the poetic nuance of the Japanese original.