from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To toil excessively; work or labour hard.
from the GNU version of the Collaborative International Dictionary of English
- intransitive v. To labor excessively.
from The Century Dictionary and Cyclopedia
- To toil excessively; labor hard.
From Middle English toswinken, equivalent to to- + swink. (Wiktionary)