to appoint; to nominate
to assume (responsibility)
to pose as
彼を委員長に任ずる決定が下された。
A decision was made to appoint him as chairman.
大臣に任ずる人選が注目されている。
The choice of person to appoint as minister is attracting attention.
社長は信頼できる部下を支店長に任ずることにした。
The company president decided to appoint a trusted subordinate as branch manager.