I. sic 1 /sɪk/ BrE AmE adverb written formal
[ Date: 1800-1900 ; Language: Latin ; Origin: 'so, in this way' ]
used after a word that you have copied in order to show that you know it was not spelled or used correctly:
We had seen several signs that said ‘ORANGE’S (sic) FOR SALE'.
II. sic 2 BrE AmE verb ( past tense and past participle sicced , present participle siccing ) [transitive] American English informal
[ Date: 1800-1900 ; Origin: seek ]
1 . to tell a dog to attack someone
sic something on somebody
He sicced his dog on me.
2 . sic 'em! spoken used to tell a dog to attack someone
3 . to tell someone in authority that someone has done something wrong, so that they are punished
sic on
He sicced his lawyers on them.