HRW says the use of barrel bombs has "terrorised" Aleppo in recent months. The bombs are crude devices, often made from oil drums or large gas bottles, packed with explosives and bits of metal, that are literally tossed over the side of helicopters.
What does "crude" mean ? Does it mean "natural"? ( based on what I saw in dictionaries about crude oil )
My perception is that when the writer writes: ...that are literally tossed over the side of helicopters, he or she really means: ... that are in large numbers fell into ground from the side of helicopters. Am I right? Does the word "literally" here means " focal" or " in large numbers" ? Or something like that? Does the word "over" means "from"? Does the word "toss" mean "thrown" , "fell" , something like that?