This is the 4383rd most frequent Spanish word.
tim
"Tim" is not a Spanish word; it is likely a proper noun or name.
In this sentence, 'Tim' is a proper noun, referring to a person's name.
Tim es un gran amigo mío.
Tim is a great friend of mine.
Here, 'tim' appears as part of the word 'timador', meaning swindler, which comes from 'timar' (to swindle).
No confíes en él, podría ser un timador.
Don't trust him; he might be a swindler.
In this usage, 'tim' is part of the word 'timbal', a percussion instrument similar to a drum.