DCHP-1 Online
plug Slang 
v. arrange the kernels (of grain) in such a way that inferior or frozen grain is concealed and an unduly high grade allowed by the elevator man.
- 1910 The temptation to "plug" the wheat was strong, and so much of it was being done that the elevator men were suspicious of every one.
- 1910 The temptation to "plug" the wheat was strong, and so much of it was being done that the elevator men were suspicious of every one.