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...
Rocker contains a carpet to catch light sediment. You rock the cradle and then take the rug out and there's gold underneath, if your lucky.
The Cradle was created in 2010.
A twist cradle
The city of Montgomery was called the Cradle of the Confederacy.
Cradle of civilization
The Cradle Will Rock was created in 1938.
And the Cradle Will Rock... was created in 1980.
The duration of Cradle Will Rock is 2.2 hours.
Rock the Cradle was created on 2008-04-03.
The Production Budget for Cradle Will Rock was $32,000,000.
Rock the Cradle ended on 2008-05-08.
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.
Rock the Cradle - 2008 Cradle Rocker's Pick 1-4 was released on: USA: 24 April 2008
Rock the Cradle - 2008 was released on: USA: 3 April 2008