Here is a 1940 George VI nickle with what looks like a Cud on the reverse left of "K.G.". There is a coin pictured on Coins And Canada with a die crack in this area (it may not be the same die but it at least suggests that is a typical area for die cracks -- I collect KGV 5c so I'm too familiar with what is typical for this series)
I believe it should correctly be called a "die crack". It's well on its way to becoming a " Cud" BUT that won't be the correct term until it totally breaks off.
"The vast majority of large die breaks occur at the die's margin. The sharp junction between die neck and die face is particularly prone to failure. Any die break that involves the rim and at least a little bit of the field is called a " Cud".
I think the coin I posted may be what they would call a " Retained Cud".
"A Retained Cud is a marginal die break that that has not fallen out."
Operationally, they say "the simplest form of what a Retained Cud is; a die crack that is from rim to rim and has a portion of either the field or a portion of a design element(s) contained within and has a lateral or vertical displacement."
But how does one determine "vertical movement". Does the fact that the denticles are filling up constitute vertical movement?
Note the weakness on the obverse opposite the " Retained Cud" on the posted coin.
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