To give you a better answer, please provide more context about where you saw this word or what you're trying to express.
Possible meanings based on the spelling:
* "Sustainment": This is the most likely meaning if the word is misspelled. It means the act of keeping something going or supporting something.
* "Suspension": This word refers to the act of hanging or holding something up.
If you can give me more information, I can provide a more accurate synonym.