Even though no one had seen them, nor could anyone ever know what time he caught the fish, the boy could tell by the clarity of his father's voice that the decision was not negotiable.
The UN and several key aid groups said women's participation in aid delivery was not negotiable and they warned that many other activities would also probably need to be paused.
So this magnificent piece of engineering is fast enough, if you just push it a little bit, to outrun its own sound, so the sound barrier is negotiable.
That means the amount of money that you receive every month or every year in this job is negotiable. So a salary is an expected amount that you'll receive every month, every pay period.