stand up to in English:

1. defend oneself against

English word "stand up to"(defend oneself against) occurs in sets:

12-14 rozdział potwór
CPE idioms and fixed phrases

2. to be able to be treated in a particular way and still stay good or correct

English word "stand up to"(to be able to be treated in a particular way and still stay good or correct) occurs in sets:

Unit 2 glossary

3. to keep your principles when challenged by an authority