noun1. a person who buys up old horses for slaughter
2. a person who buys up old buildings and breaks them up for scrap
3. (usually plural) slang another word for testicle
4. Irish slang a despicable person
verb5. (tr; usually passive) slang to exhaust; tire
Word origin
C16: probably from
nacker saddler, probably of Scandinavian origin; compare Old Norse
hnakkur saddle