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G-man (n.)
"FBI agent," 1930, shortening of government man; used earlier in an Irish context (1917), but the abbreviation is perhaps the same one.
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Definitions of G-man from WordNet
Dictionary entries near G-man
glycogen
glycogenic
glycolysis
glyph
glyptodon
G-man
gn-
gnarl
gnarled
gnarly
gnash