put down to

put (something) down to (something else)

To regard a situation, action, or outcome as being the result of some specific aspect, condition, or event. The runner put her leg pain down to simple muscle fatigue, but she was shocked to learn that it was due to deep vein thrombosis. I put most of my success down to the excellent teaching I received in secondary school.
See also: down, put

put (something) down to (something)

To deem something to be the cause of something else. We put David's erratic behavior down to sleep deprivation.
See also: down, put

put something down to something

 and set something down to something
to explain something as being caused by something else. I put his bad humor down to his illness. We set your failure down to your emotional upset.
See also: down, put
References in classic literature ?
A poem of the satirical kind cannot indeed be put down to any author earlier than Homer; though many such writers probably there were.
Due to the severe injuries the creamy brown-coloured animal sustained, the RSPCA said it was put down to end its "unbearable suffering".
Our house is now much admired by our friends, a fact that my wife puts down to its stylishness, and that I put down to their politeness - Harry Enfield.I practised 26 hours a week and ultimately achieved the status of a decent seven-year-old - Actor Russell Crowe who had to learn the violin for a new film part.
Two horses weren't killed, they were put down to save them from further suffering.