The meaning of the Acronym GRIM is...

GRIM is

• Grim Reapers In Mass

More Meanings For GRIM:

• Glass Refractive Index Measurement
• Grim Reapers In Mass
• General Record Of Incidence Of Mortality
• GPS Receiver Interface Module

GRIM is also in:

• Chemistry
• Funnies
• Hospitals
• Military