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The waters grew suddenly lighter, and my spirits rose accordingly. I shouted down to those below that I saw daylight ahead, and a great shout of thanksgiving reverberated through the ship. A moment later we emerged into sunlit water, and immediately I raised the periscope and looked about me upon the strangest landscape I had ever seen.
1885, Transactions of the Michigan State Medical Society, page 55:
[…] will show it not only enlarging the periscope of knowledge, but contributing to the amelioration of the condition of unfortunate and suffering humanity […]
periscope (third-person singular simple presentperiscopes, present participleperiscoping, simple past and past participleperiscoped)
(intransitive) To rise and peer around, in the manner of a periscope.
1951, National Geographic Magazine: Volume 99:
Thousands of ungainly black-beaked heads would periscope and freeze in the direction of the approaching intruder.
1987, Field & Stream March 1987:
The second summer I had a great deal of interest but weeks passed before I worked up the nerve to approach her, the confidence finally gained when I caught a queen snake that periscoped within reach, one of the last I ever saw swimming in Cross Creek.
2008, Doug Stamm, The Springs of Florida, page 99:
Areas of barren sand are likely spots to look for its [the turtle's] periscoping head. Its fondness for the bottom is equally matched by its ability to quickly disappear and tunnel into it.
2010, Jim Moran, The Sentinel: A Wildfire Story, page 236:
Her black and white head suddenly popped out from under the covers and periscoped around.