overtip 
verb [with object]
Give an excessively generous tip to: the food was so cheap that I overtipped the waitress...
- Aunt Elsa was still at the door, overtipping the delivery men, and Dad Matheson had claimed one of the kitchen chairs and was sipping tap water from a mug.
- Arriving in gringo alley, I overtipped the cab driver since the funds fell out of Gatlin's deep pockets.
- Matt overtipped him, having already offered to carry one of the bags himself.
- predentary
- predentate
- predesign
- predesignate
- predesignation
- predestinarian
- predestinarianism
- predestinary
- predestinate
- predestinately
- predestination
- matronhood
- matronise
- matronize
- matronizing
- matronlike
- matronliness
- matronly
- matron of honour
- matronship
- matronymic
- matross
- mat-rush
- matryoshka
- matryoshka doll