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,

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

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

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

standing by at home (e.g. to prevent the spread of illness) / being on furlough; being temporarily laid off

(colloquial) current boyfriend

everything

(slang) Alternative form of 彼氏 (kareshi, “boyfriend”)

everyone, one and all

(colloquial) Clipping of 意味深長 (imishinchō).