What is Sucker ?
Sucker is (noun) 1. a part of an animal which sticks to a surface by sucking An oc- topus has rows of suckers on its arms. 2. a lit- tle plastic cup which sticks to a surface by suction Some hooks can be glued to the wall, others stick with suckers. 3. a person who is easily tricked into doing something 4. a person who cannot resist something He’s a sucker for chocolate desserts. He’s a sucker for any pretty girl. 5. (of a plant.) a shoot which comes from the bottom of the stem or from a root You need to cut all those suckers off the roses.
source: Easier English, Student Dictionary Upper Intermediate Level