Read the definitions carefully and select the correct words.
1. to officially or legally allow someone to do something - used about laws or people
2. having official permission or approval
3. to make something clearer or easier to understand
4. if something heightens a feeling, effect etc, or if a feeling etc heightens, it becomes stronger or increases
5. to increase in degree or strength, or to make something do this
6. to increase something such as profit or income as much as possible
7. to reduce something that is difficult, dangerous, or unpleasant to the smallest possible amount or degree
8. to become shorter or make something shorter
9. to make something easier or less complicated
10. to become an expert in a particular area of work, study or business
11. to state something in an exact and detailed way
12. to become firm, steady, or unchanging, or to make something firm or steady
13. to become stronger or make something stronger
14. to make someone or something less powerful or less important, or to become less powerful