I wonder if someone would define this expression for me? That I know of, I have never experienced this on any pen I have ever owned; but (but...!) I am wondering if I have it on my Pelikan M1000. The pen often has trouble starting and runs dry all the time while I write (just suddenly goes quite dry). Now, my fine nib is rather flexible, even for a M1000, and I assume, for starters, that the feed is not keeping up and I am certainly awaiting an announcement from Joey Grasty that his replacement feed is available (it seems to have been on the cards for a long time and his website still says "November 2019").
I write at an angle of perhaps 35-45 degrees from the horizontal and I do not rotate my pen. However, I notice that if I hold the pen more upright the ink flow seems to improve slightly...perhaps this has some bearing on matters? I bought the pen used some months ago, so have no idea about previous owner's habits.
I know: photos would help...I shall work on that later...meanwhile: any ideas, please?