sucker DCHP-1 (pre-1967)
1 n.
one of a number of fresh-water fish of the family Catostomidae, which are bottom feeders having mouths so shaped as to give the appearance of being engaged in sucking.
2a † n. — Slang
a gullible person; a fool.
2b † n. — Slang
play (one) for a sucker, deceive by easy means; take advantage of (one's) gullibility.