1) Clean with a currycomb 2) Comb 3) Horse-grooming tool 4) To groom using such a comb 5) Used to curry horses 
metal comb used to groom horses
• (v. t.) To comb with a currycomb. • (n.) A kind of card or comb having rows of metallic teeth or serrated ridges, used in currying a horse.
Cur'ry·comb` noun A kind of card or comb having rows of metallic teeth or serrated ridges, used in currying a horse. 
[n] - a square comb with rows of small teeth
noun a square comb with rows of small teeth; used to curry horses
a comb, usually with rows of metal teeth, for currying horses.