he; boyfriend

to know, be aware of / to learn, acquire, / to be acquainted with, to know (someone) / (colloquial, in the negative) to care in the least about, to be concerned with,

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

Alternative spelling of 物知り: a person with broad knowledge, a knowledgeable person

stem or continuative form of 知る (shiru) [godan]

as one would expect

(literally) know the other side and yourself, a hundred battles will not be perilous

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