Other than the Hand that Rocked the Cradle movie, this means exactly what it says.
"Robbing the Cradle" is probably what you mean....it's ok people get it mixed up all the time.
OR...
~ Rock the Cradle: It can also referring to "make love", or "make babies"
"Rock the cradle" is an idiom that means to handle a situation carefully and gently, similar to how one would rock a baby's cradle to soothe it. It can also refer to maintaining stability or balance in a delicate situation.
And the Cradle Will Rock... was created in 1980.
The Cradle Will Rock was created in 1938.
The duration of Cradle Will Rock is 2.2 hours.
Rock the Cradle ended on 2008-05-08.
Rock the Cradle was created on 2008-04-03.
The Production Budget for Cradle Will Rock was $32,000,000.
Cradle Will Rock was created on 1999-12-10.
cradle mountain is a rock containing vigorous gases
Cradle Will Rock grossed $2,899,970 worldwide.
Cradle Will Rock grossed $2,899,970 in the domestic market.
If you're referring to someone dating a much younger person, they are most definitely "robbing the cradle" and "grave snatching" is it's antonym. But if you mean the "the hand that rocks the cradle" the early 90's thriller or the poem from over 100 years ago with the same name, then "rock the cradle" is correct...
Rock the Cradle - 2008 Cradle Rocker's Pick 1-4 was released on: USA: 24 April 2008