Across
- 4. make (something) more complicated.
- 6. reach a climax or point of highest development.
- 7. make (something) active or operative.
Down
- 1. make or prove (an argument, statement, or theory) unsound or erroneous.
- 2. treat (a person or animal) with a vaccine to produce immunity to a particular infectious disease or pathogen.
- 3. make ineffective; nullify.
- 5. make (something) look more attractive by adding extra items or images to it