quitting
v.v. stopping a job, a habit, or an activity. You use this when you decide not to do something anymore.
v. the present participle of 'quit', meaning to cease an activity or resign from a position. Often implies a voluntary and permanent cessation of effort or employment.
She is quitting her job to travel the world.
After twenty years of smoking, he is finally quitting for the sake of his health.
The board members were shocked to learn that the CEO was quitting just weeks before the merger was finalized.
The verb is transitive when referring to a job or habit, but can be intransitive when describing the general act of giving up.
He is quitting from his jobHe is quitting his jobThe verb 'quit' is transitive and does not require the preposition 'from' when followed by a direct object.