Expressions (phrases, clauses, etc.), Godan verb with 'ru' ending
to undertake a duty
私の参謀としてついたからには、危機感を持って任にあたって貰わねば困ります。If you're with me as a staff officer, then I need you to bring a sense of danger with you to your work.
Also written 任にあたる【にんにあたる】