Verb (5-dan, す, intransitive)
1. to take one's leave; to excuse oneself; to leave; to depart
Verb (5-dan, す, transitive)
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.