English
guarder
From guard + -er.
Formed from guard + -er
Proto-Germanic *wardāną ‘to guard, protect’
…
Early Medieval Latin wardō
Old French guarder ‘to protect, guard’
Old French guarde ‘protection; guard’
Middle English garde ‘guardianship’
English guard
The story
School slang relates to Stonyhurst College in the United Kingdom.
Today it means
noun A person who guards; a guard.
Language periods are conventional ranges, not dates for this word.
Etymograph / guarder