sín verb /sĩ́/
Definitions
  1. to crack a nut (to reach the inner seed or kernel) intransitive
Other entries with this spelling
Wiktionary records 4 entries spelled “sín”. You're reading one of them; here are the others.
Used in
Possibly used in
Source: Wiktionary · etymology 12, where this word is spelled “sin”. Reference: en-sin-yo-verb-JUxVk9B-