Egger-on

[…] let there be an honest likyng, and let flattery the egger on of vice be sette a loufe […]

Source: wiktionary

Consult the mirror see it shews / Your Eggers on will turn your foes

Source: wiktionary

I no longer hesitated; the next day I spent the lunch hour fighting the older, bigger, and heavier boy. But the eggers-on were disappointed because I was not beaten, despite the headache I carried away.

Source: wiktionary

Our heartfelt thanks go out to the goodly fellowship of personal sources, expert witnesses, and eggers-on who have supplied us with many of the cheerful facts and enlightening suggestions that have gone into the making of this book […]

Source: wiktionary