solid ground/rock
a solid object
a solid structure
Having solid ground beneath her feet again she sighed with relief for having survived this adventure. (First Certificate in English; B2; German)
Liquid and solid waste is collected in the tank.
Freeze the mixture for about 3 hours or so until solid.
Of the total amount of electrical power produced in the world, solid fuel is by far the most important contributor (44%). (International English Language Testing System; C1; Swedish)
solid furniture
[If] you have an accident, you have less chance [of] get[ting] hurt if you are sitting in [a] big, solid vehicle. (First Certificate in English; B2; Italian)
a solid silver bracelet
The dark marble is easy to keep clean and the solid brass handles look luxur[ious]. (Certificate in Advanced English; C1; Swedish)
This provided solid evidence that he committed the crime.
The drama course gives students a solid grounding in the basic techniques of acting.
It may help you, because you have a solid background and plenty of theoretical information which you could use in practi[c]e. (Certificate of Proficiency in English; C2; Polish)