辞す
1
to take one's leave;to excuse oneself;to leave;to depart
See also:
辞する (じする)
彼はその役職を辞した。
He resigned from the post.
2
to resign (from);to step down;to leave (one's position);to quit
3
to decline;to turn down;to refuse
4
to do unwaveringly;to be prepared to do;to not mind doing
in the negative as ...を（も）辞さない, ...を（も）辞さず, etc.
See also:
辞さない (じさない)