from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To slack up; be or grow slack; pall.
- v. To be slack in; neglect by idleness; relax; render slack; delay; lose or spoil by slackness.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To neglect by idleness; to delay or to waste by sloth.
from The Century Dictionary and Cyclopedia
- To neglect by idleness; relax; render slack; delay.
From for- + slack. (Wiktionary)