The Vietnamese word "sán" has a couple of different meanings and uses that are important to understand.
As a noun:
As a verb:
In more complex sentences, you might see "sán" used in various tenses or with additional descriptors. For example: - "Tôi thấy con chó sán lại gần tôi." (I saw the dog come up to me.) - "Bác sĩ đã nói rằng sán có thể rất nguy hiểm." (The doctor said that flatworms can be very dangerous.)