to encourage, support, or countenance by aid or approval, usually in wrongdoing: to abet a swindler; to abet a crime.
Origin of abet
1275–1325;Middle Englishabette (whence Old Frenchabeter, unless perhaps the latter, of Germanic orig., be the source for the ME), Old English*ābǣtan to hound on, equivalent to ā-a-3 + bǣtan to bait, akin to bite
Related formsa·bet·ment, a·bet·tal, nounun·a·bet·ted, adjectiveun·a·bet·ting, adjective
late 14c. (implied in abetting), from Old French abeter "to bait, to harass with dogs," literally "to cause to bite," from a- "to" (see ad-) + beter "to bait," from a Germanic source, perhaps Low Franconian betan "incite," or Old Norse beita "cause to bite," from Proto-Germanic *baitjan, from PIE root *bheid- "to split" (see fissure). Related: Abetted; abetting.