Help! I can't find any information on the origin of the idiom/expression: Grease someone's palm. Please help me!

Scroll down to the Online Etymology Dictionary at this site. It explains related uses of "grease" and gives a date for the origin of "grease one's palm."

http://dictionary.reference.com/browse/grease

"grease (someone`s) palm

- to pay a person for something done or given, to bribe someone
We had to grease the palm of the customs agent at the border to get our goods into the country."

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To find information about the origin of the idiom "grease someone's palm," you can visit online resources such as the Online Etymology Dictionary or idiomconnection.com.

In this case, you can scroll down to the Online Etymology Dictionary at the link provided (http://dictionary.reference.com/browse/grease) to find information about the origin of the phrase. The definition states that "grease (someone's) palm" means to pay a person for something done or given, or to bribe someone. It gives an example sentence and usage context.

If you want to explore further, you can also search for related websites that provide more details on the origin and usage of the idiom. In this case, you could visit idiomconnection.com and search for "grease (someone's) palm" to find additional information on the expression and related idioms.

Remember, it's always good to check multiple sources to get a more comprehensive understanding of the origin and meaning of idioms and expressions.