solid understanding

noun phrase
UK /ˈsɒl.ɪd ˌʌn.dəˈstæn.dɪŋ/
US /ˈsɑː.lɪd ˌʌn.dɚˈstæn.dɪŋ/

A solid understanding means you know something really well and are not confused about it.

After studying all week, she had a solid understanding of the math lesson.


OTHER MEANINGS

2. A strong and reliable grasp of a subject gained through careful study or practice.

His solid understanding of the rules helped the team win the game.

3. A dependable and well-grounded knowledge that does not easily fade or break down.

The training gave new workers a solid understanding of safety procedures.

4. A complete and steady mental picture of how something works.

Reading the manual gave her a solid understanding of the machine.