In Syriac pgr is usually "body" while šld is "corpse" (but see citations). The variant between those two words at TgJ Jud14:9 is indicative rather that in the Jewish tradition there was uncertainty over whether this word could serve for the carcass of an animal. Note that it is never a living body in JLAtg.
  
Page refs. in other dictionaries: DJPA: 424b; DJBA: 887b; Jastrow: 1136; Levy Ch-W: 2:254; Tal Sam: 673; DNWSI: 901;

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Derivatives:

pgr vb. a/a   D to break up, to destroy

mpgrw (məp̄aggərū, məp̄aggərūṯā) n.f.   desolation, destruction

pgwr v.n.D   destruction