How Can Someone Be So Naive To Believe...
Society & Culture6 mins ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.The phrase uses "grease" in the sense of "enrich", which apparently has been around since the 1500s. Source: Answers.com.
As seen in the film Gladiator it is possible to stab/kill someone with your left hand whilst your right hand is 'embraced'. Although admittedly, you wouldn't expect it.
Besides, if you were close enough to shake hands the sword would have been pretty useless. To show that you meant peace, the sword would have been drawn hilt first. It has nothing much to do with shaking hands.