Definition:
To suss out means to investigate or figure out something, usually by asking questions or observing carefully.
Use case:
I had to suss out the new guy at work to see if he was trustworthy before I could give him access to sensitive information.
• Can you suss out who leaked the confidential information?
• Can you suss out which movie we should watch tonight?
• Let me suss out the situation before making any decisions.
• I'll suss out the menu before we decide where to eat.
• I need to suss out the company's financial performance before investing my money.
• I'm trying to suss out the best way to approach this project.