grease one's palm

[grease one's palm] or [grease the palm] {slang} 1. To pay a personfor something done or given, especially dishonestly; bribe.

Somepoliticians will help you if you grease their palms.

2. To give atip; pay for a special favor or extra help.

We had to grease thepalm of the waiter to get a table in the crowded restaurant.