The discolouration of printed material with brown marks(noun)
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Use "foxing" in a sentence
"Nice fizzy sign too Mr. A with only minimal 'foxing' as the enamelists say (or would if they didn't use the more prosaic term rust)."
"They were still "foxing," or as my Samoan servant called it, _le toga-fiti e mate_ (pretending to be dead)."
"Now we will go and recover the flies off the hatches; and you will agree that there is more cunning, more science, and therefore more pleasant excitement, in 'foxing' a great fish out of a stop-hole, than in whipping far and wide over an open stream, where a half-pounder is a wonder and a triumph."