This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
俿 combines 亻 (person) with 虎 (tiger), but the historical origin and original meaning are uncertain.
A person 亻 beside a tiger 虎 suggests a human-tiger relationship, but the intended meaning is lost. Remember it as a mysterious kanji.
For チ, imagine a person 亻 whispering 'chi' to calm a tiger 虎: chi -> チ.