sucker

Concise Oxford English Dictionary © 2008 Oxford University Press:
sucker/ˈsʌkə(r)/

▶noun

• 1 a rubber cup that adheres to a surface by suction.

  ■ a flat or concave organ enabling an animal to cling to a surface by suction.

• 2 the piston of a suction pump.

  ■ a pipe through which liquid is drawn by suction.

• 3 informal a gullible or easily deceived person.

  ■ (a sucker for) a person especially susceptible to or fond of (a specified thing).

• 4 N. Amer. informal an unspecified person or thing.

• 5 Botany a shoot springing from the base of a tree or other plant, especially one arising from the root at some distance from the trunk.

  ■ a side shoot from an axillary bud.

• 6 a freshwater fish with thick lips that sucks up food from the bottom. [Family Catostomidae: many species.]

• 7 N. Amer. informal a lollipop.

▶verb

• 1 Botany (of a plant) produce suckers.

• 2 N. Amer. informal fool or trick.