transcription, транскрипция: [ meɪnsprɪŋ ]
( mainsprings)
If you say that an idea, emotion, or other factor is the mainspring of something, you mean that it is the most important reason or motive for that thing. ( WRITTEN )
My life has been music, and a constant search for it has been the mainspring of my life...
You begin to understand what actions were the mainspring of the story.
N-COUNT : usu sing , usu the N of n