The word "sucker" has a few different meanings in English, and I'll explain them simply for you.
Fish: In a biological context, a "sucker" refers to a type of freshwater fish found mainly in North America. These fish have a thick-lipped mouth, which they use to suck food from surfaces. They are related to carps.
Candy: A "sucker" can also mean a hard candy on a stick, which you can lick or suck on. It is often called a lollipop in some regions.
Gullible Person: In informal language, a "sucker" is a person who is easily fooled or taken advantage of. This meaning is more common in casual conversation.
In advanced contexts, "sucker" can also be used in idiomatic expressions or phrases: - "You sucker!": This can be said jokingly to someone who has been tricked or caught off guard. - "Don’t be a sucker!": A warning to someone not to be naive or easily deceived.
The word "sucker" can be used in various contexts, from describing a type of fish to talking about candy or describing a person who is easily deceived.