noun

1. a person or thing that sucks
2. ☆ any of a family (Catostomidae, order Cypriniformes) of bony fishes with a mouth adapted for sucking, found in freshwater of E Asia and North America
3. a part or device used for sucking; specif.,
   1. a pipe or conduit through which something is sucked
   2. the piston or piston valve of a suction pump
   3. an organ used by the leech, fluke, remora, etc. for sucking or holding fast to a surface by suction
4. ☆ lollipop
5. ☆ Slang
   1. a person easily cheated or taken in; dupe
   2. a person highly susceptible to the attractions of something specified
   3. any person or thing: often used humorously or affectionately, or to express mild annoyance
6. Bot. a subordinate shoot from a bud on the root or stem of a plant

transitive verb

1. to remove suckers, or shoots, from
2. ☆ Slang to make a dupe of; trick

intransitive verb