The term "hm" is often used in informal communication, such as texting or online chatting. It generally indicates:
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Thinking or hesitation: When someone is unsure or considering something.
Example: "Hm, I'm not sure about that." -
Mild surprise or curiosity: Reflecting a thoughtful or questioning reaction.
Example: "Hm, that's interesting." -
A filler sound: Similar to "uh" or "um," used to pause or gather thoughts.
So, "hm" is a versatile expression that conveys contemplation, uncertainty, or mild interest depending on the context.