I thought this due to their movement over ice Irregularities.
"My Attainment of the Pole"
Frederick A. Cook
Hence the striking Irregularities in the make-up of many early books.
"Fine Books"
Alfred W. Pollard
If it had been imagined at head-quarters that Sergeant M'Laughlin winked at Irregularities in the application of the law at Wirreeford, he might have been moved on, and that would not have suited the landlord of the Black Bull, who would then have had another man to deal with, or have found that another man was dealing with him.
"The Pioneers"
Katharine Susannah Prichard