on solid ground

phrase

1. idiomatic Confident or justified regarding a subject or argument. He's on solid ground when he's analyzing the pros and cons of convertible debentures.

   Similar: well-grounded, well-founded · Opposite: ill-grounded, ill-founded, groundless, baseless, flimsy, unjustified

2. idiomatic In a safe and secure position. Our department is on solid ground if the company starts flirting with the idea of layoffs; some other departments are in shakier positions.
3. Used other than figuratively or idiomatically: see on, solid, ground: not on top of anything that is likely to give way or disintegrate (e.g., loose soil, shaky structures, water, an ice road, clouds). Mr and Mrs Liu got caught in the flood that ripped through their low-lying neighborhood. "We're just thanking God that we're back on solid ground," Mr Liu told this reporter. "We were clinging to a log at one point."