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cradle snatcher

British  

noun

  1. informal someone who marries or has an affair with a much younger person

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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I ask' all over the neighbourhood, an' not a woman but looked on me for a cradle snatcher—thought I wanted to abduct her child away from her.

From Project Gutenberg