light on

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light (up)on someone or something

 
1. Lit. to land on someone or something; to settle on someone or something. (Upon is formal and less commonly used than on.) Three butterflies lit on the baby, causing her to shriek with delight. The bees lit on the clover blossom and pulled it to the ground. Her glance lit upon a dress in the store window.
2. Fig. to arrive at something by chance; to happen upon something. The committee lit upon a solution that pleased almost everyone. We just happened to light upon this idea as we were talking to each other.
See also: light, on

light on

Also, light upon. Happen upon, come across, discover. For example, John was delighted to light on a new solution to the problem, or We were following the path when suddenly we lit upon a cave. [Second half of 1400s]
See also: light, on
References in classic literature ?
It is now necessary that we should try to throw some light upon this third bullet, which has clearly, from the splintering of the wood, been fired from inside the room.
The stable-boy threw a light upon the matter by remembering that a farmer of that name lived some miles off, in the direction of East Ruston.
As I looked after his figure, crossing the waste in the moonlight, I saw him turn his face towards a strip of silvery light upon the sea, and pass on, looking at it, until he was a shadow in the distance.
The scantiness of materials is indeed a formidable difficulty; but no one knows better than Dr Dryasdust, that to those deeply read in antiquity, hints concerning the private life of our ancestors lie scattered through the pages of our various historians, bearing, indeed, a slender proportion to the other matters of which they treat, but still, when collected together, sufficient to throw considerable light upon the vie priv
Perhaps in my next I may be able to throw some light upon this also.
It is true that I had thrown a light upon the fate of Brunton, but now I had to ascertain how that fate had come upon him, and what part had been played in the matter by the woman who had disappeared.
The rays fell from a thick green funnel in a plateful of strong light upon a table deep in books.
And though the war departments of the nations have continued to experiment in their secret laboratories, they have so far failed to light upon the slightest trace of the secret.
Pickwick smiled again, a broader smile than before, and was about to continue the process of undressing, in the best possible humour, when he was suddenly stopped by a most unexpected interruption: to wit, the entrance into the room of some person with a candle, who, after locking the door, advanced to the dressing- table, and set down the light upon it.
Can we, then, by the citation of some of those instances wherein this thing of whiteness --though for the time either wholly or in great part stripped of all direct associations calculated to impart to it aught fearful, but, nevertheless, is found to exert over us the same sorcery, however modified; --can we thus hope to light upon some chance clue to conduct us to the hidden cause we seek?
Away down on the level under the black mass of the Castle, the town lay, stretched along the river, its intricate cobweb of streets jeweled with twinkling lights; there were rows of lights on the bridges; these flung lances of light upon the water, in the black shadows of the arches; and away at the extremity of all this fairy spectacle blinked and glowed a massed multitude of gas-jets which seemed to cover acres of ground; it was as if all the diamonds in the world had been spread out there.
Edward have got some business at Oxford, he says; so he must go there for a time; and after THAT, as soon as he can light upon a Bishop, he will be ordained.
Pocket they held in contempt; but they allowed the poor soul to have been heavily disappointed in life, because that shed a feeble reflected light upon themselves.
Drawing upon all of these assets, IAFRI will be in an unrivalled position to support food security nationally and globally, throwing light upon every aspect, from food production and its environmental consequences, to the implications, both personal and societal, of the choices that consumers make every day as they fill their supermarket trolleys.
Most recently, he wrote Light upon Light: 5 Master Pathways to Awaken the Mindful Self.