Here are some ways to think about the word:
* Like digging a hole beneath a foundation: It weakens the structure from below, making it unstable.
* Like eroding a mountain: The process is slow but eventually breaks down the whole thing.
* Like discrediting someone's authority: It chips away at their power and influence.
Examples:
* "The constant criticism undermined her confidence."
* "The company's recent scandals have undermined public trust."
* "His lies undermined the entire investigation."
It's important to note that "undermine" often carries a negative connotation, implying a deliberate attempt to sabotage or weaken something.