When you want to defend or support someone or something, it is important to use assertive and confident language. This is where synonyms for the phrase "stand up for" can come in handy. Some alternative expressions with similar meanings include "speak up for," "defend," "champion," "protect," "advocate for," and "fight for." Each of these phrases suggests taking action in order to defend or support something or someone that is vulnerable or under attack. By using these types of strong and assertive phrases, you can convey your dedication to standing up for what you believe in and fighting for what's right.