Grease somebody’s palm
Definition 1 of 1
Pro Tip 1/3Negative Connotation
This phrase suggests dishonesty and often hints at illegal activity. Be aware of its negative tone. 
The shady deal to construct the new building involved greasing somebody’s palm.
Pro Tip 2/3Slang Usage
'Grease somebody’s palm' is considered slang and is informal, so avoid using it in formal writing or speech. 
When he said he 'greased the inspector’s palm', everyone knew what he meant.
Pro Tip 3/3Cultural Sensitivity
Some cultures may find the idea very offensive. Know the cultural context before using the phrase. 
In her country, greasing somebody’s palm could result in serious legal consequences.