This is the 15428th most frequent Turkish word.
sırtından
"From one's back" or "off one's back."
In this sentence, 'sırtından' indicates the location from which the action of taking off the coat is done.
O, montunu sırtından çıkardı.
He took off his coat from his back.
Here, 'sırtından' metaphorically represents the source of the burden being removed.
Bir arkadaş sorunlarını onun sırtından yük gibi aldı.
A friend took their problems off like a burden from his back.
In this usage, 'sırtından' is used figuratively to refer to attributing responsibility or blame to someone else.