cross palm with silver
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Related to cross palm with silver: cross-purposes, cross off
cross someone's palm with silver
Fig. to pay money to someone in payment for a service. (A fortune-teller might ask for a potential customer to cross her palm with silver. Used in that sense or jocularly for something like tipping a porter.) I crossed his palm with silver, but he still stood there. You will find that things happen much faster in hotels if you cross the staff's palms with silver fairly often.