Longman Dictionary of Contemporary English - sucker

~1 n 1 person informal someone who is easily deceived, tricked, or persuaded to do something they do not want to do  (You fell for that old line? Sucker!) 2 be a sucker for sth to like something so much that you cannot refuse it  (She's a real sucker for old movies.) 3 part of an animal not technical a part of an insect or of an animal's body that it uses to hold on to a surface  (Tree frogs have suckers on their feet.) 4 sweet AmE a lollipop (2) 5 plant a part of a plant that grows from the root or lower stem of a plant to become a new plant 6 rubber a flat piece of rubber that sticks to a surface by suction ~2 v sucker sb into sth phr v AmE to persuade someone to do something they do not want to do, especially by tricking them or lying to them  (sucker sb into doing sth)  (Laurie got suckered into babysitting her little sister.)