Verb (5-dan, む, intransitive)
1. to grapple with; to wrestle with; to engage in a bout; to be matched against
今日は格上の力士と取り組む。Today I'm matched against a higher-ranked wrestler.
2. to tackle (e.g. a problem); to come to grips with; to work hard on
ここは真剣に取り組まないとダメだ。We have to tackle this seriously.