swan-song

swan-song 绝唱

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 THE SWAN AND HIS OWNER

They say that swans sing when they are about to die. A certain man chanced upon a swan that was for sale and bought him, since he had heard that swans sing very beautifully. At the man's next dinner party, he came and got the swan, expecting that the bird would serenade his guests at dinner. The swan, however, was completely silent. Later on, when the swan realized that he was about to die, he began to sing his funeral dirge. When his owner heard him, he said, 'Well, if you are going to sing this song only at the moment of your death, then I was a fool for having commanded you to do it. I should have ordered you to be butchered instead!'

Some people are the same way: they will agree to do things under compulsion that they are not willing to do as a favour.

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swan-song 绝唱
last singing or song before one's death.
I didn't expect it to be her swan-song.     想不到这竟成了她的绝唱。