Eylen (v.) - to trouble, afflict.
And whan that pertelote thus herde hym roore,
She was agast, and seyde, herte deere,
What eyleth yow, to grone in this manere?
Ye been a verray sleper; fy, for shame!
And he answerde, and seyde thus: madame,
I pray yow that ye take it nat agrief.
- Chaucer, Geoffrey: The Canterbury tales (1387-1394)
The Middle-English Word of the Day is selected from Mayhew and Skeat's
"Concise Dictionary of Middle English."
As found on Greg Lindahl's website
The example text was found at the Middle English Collection of the University of Virginia Library.