not for a/one minute/moment/second/instant

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not for a moment

not at all; not even for a short amount of time; never. I don't want you to leave. Not for a moment! I could not wish such a horrible punishment on anyone. Not for a moment!
See also: moment, not

not for a moment

Never, not in the least, as in Not for a moment did I believe he was telling the truth. This expression employs moment in the sense of "the tiniest length of time," a usage dating from the mid-1300s.
See also: moment, not

not for a/one ˈminute/ˈmoment/ˈsecond/ˈinstant

(informal) not at all; definitely not: I didn’t think for a minute that he was married.Not for one instant would I ever consider going there on holiday again.
See also: minute, moment, not, one, second
References in classic literature ?
For an instant the blacks pressed close to reach me with their shorter swords, but presently they gave back, and the esteem in which they suddenly had learned to hold my sword arm was writ large upon each countenance.
At the same instant I saw that the thing that had struck us was the trailing anchor of a rather fair-sized air vessel; possibly a ten man cruiser.
Another instant, and she had told me that which I would have given all but life itself to know.
For an instant I stood there watching with Dian at my side.
At the same instant Dian caught my arm and pointed toward the village.
His eyes fell upon the horses, grazing upon the scanty pasture, and in an instant all had come back to him--his mission, his comrades, the need for haste.
Together they launched themselves upon me, and though I ran one of them through the heart on the instant, the other fastened its gleaming fangs about my sword arm above the elbow, and then with her sharp talons commenced to rake me about the body, evidently intent upon disemboweling me.
Sing levelled his revolver and fired at the foremost, and at the same instant Professor Maxon, with a shrill, maniacal scream, launched himself full upon a second.
In an instant he forgot that he had come here to kill the white-haired man, and with a bound stood in the center of the room--an unarmed giant towering above the battling four.
He was, upon the instant, another creature--wary, alert, ready.
The boy turned and fled, and at the same instant the lioness charged.
The other thern was engaging me at the time, and I was forcing him back--touching him here and there with my point until he was bleeding from a dozen wounds, yet not being able to penetrate his marvelous guard to reach a vulnerable spot for the brief instant that would have been sufficient to send him to his ancestors.
It was then that Lakor quickly unslung a belt from his harness, and as I stepped back to parry a wicked thrust he lashed one end of it about my left ankle so that it wound there for an instant, while he jerked suddenly upon the other end, throwing me heavily upon my back.
I saw his wild endeavors to regain his equilibrium; I saw him reel drunkenly for an instant upon the brink of eternity and then, with a loud scream, slip into the sea.
I fell heavily upon him, but was upon my feet in the instant.