feedback
In French, the word for feedback is 'retour'. It is mostly used in the same context as in English, to provide criticism or advice after an event or action. However, pay attention to the context as in technical terms, 'retour' may also refer to return or comeback in certain situations.
I am back at home
This phrase implies that the speaker has returned to their house after being away for a period of time. 'Retour' in this context translates to 'back' in English.
The man returned to his work
In this sentence 'retour' is used to describe the action of the man going back to his work. It does not necessarily mean that the man has resumed the same job, but that he simply returned to work.
The use of feedback gives echo to the song
This is a metaphorical use of 'retour'. 'Retour' translates to 'feedback' which refers to a sound loop in this context, adding a kind of echo to the song.