If you shout something from the rooftops, you say it or announce it in a very public way. When we have something definite to say, we shall be shouting it from the rooftops. the upper surface of a roof
[ 'rüf, 'ruf ] (noun.) before 12th century. Middle English, from Old English hrOf; akin to Old Norse hrOf roof of a boathouse and perhaps to Old Church Slavonic stropu roof.