be on firm / solid ground

/biː ˌɒn fˈɜːm ɡɹˈaʊnd/

/biː ˌɑːn fˈɜːm ɡɹˈaʊnd/

[phrase]

to be on firm / solid ground

[PHRASE]

to be in a strong position in an argument due to having all the facts

Examples

1. They got on their lifeboats, and they traveled some 300 miles to an island, the Elephant Island, where they now were on solid ground, but on a tiny beach where they wouldn't survive.

2. And that if they really felt, if they really felt that they were on solid ground, they would have cooperated and they'd have said, "Yeah, we were right because of x, y, and x and we still stand by it."

3. First of all, I think that Thomas Piketty's work has created a big focus on wealth and income inequality like there has never been, and despite the debate-- and by the way I think that he is on solid ground with his results-- the census, the Congressional Budget Office, and many other sources support his results for the United States concentration of wealth and income inequality.

4. Nothing we have is on solid ground, and isn't that wonderful?