Verb (1-dan, intransitive)
1. to become known; to come to light; to be discovered
2. to be known; to be understood
usu. in the negative
3. to clearly not amount to much; to be insignificant
4. to be evident; to be obvious; to go without saying
as 知れたこと
5. to be very intense (of worry, hope, etc.); to be severe
as どんなに…か知れない, どれほど...か知れない, etc.