crocodile tears
if someone sheds crocodile tears, they seem sad, sorry, or upset, but they do not really feel this way

[TahlilGaran] Dictionary of Contemporary English ▲

crocodile tears
a show of sorrow that is not real
The man said that he was very sorry but his tears were only crocodile tears.

[TahlilGaran] English Idioms Dictionary ▲

crocodile tears
n. Pretended grief; a show of sorrow that is not really felt.
When his rich uncle died, leaving him his money, John shed crocodile tears. (From the old legend that crocodiles make weeping sounds to attract victims and then shed tears while eating them.)

[TahlilGaran] English Idioms Dictionary ▲