Duty

Frequent enough that you will keep running into it once you read past headlines.

More common than 打 (Hit), less common than 士 (Samurai).

A leader on the left stands before a king on the right — the leader accepts the king's assignment, taking on a new duty to serve the realm.

In words

任すまかす to entrust;to leave to a personN1

任せるまかせる to entrust to another,to leave toN3

任務にんむ duty;function;office;mission;taskN1

任 is rank 339 of 2,608 in published Japanese.