IPA: /ˈdreɪnər/
KK: /ˈdreɪnər/
A tool or device used to remove liquid from something, or a person who removes water from an area or explores underground passages.
The plumber used a drainer to clear the flooded basement.
Drainer → It is formed from "drain" (from Old French *drain*, meaning to draw off liquid) and "-er" (meaning a person or thing that performs an action). A drainer is a device or person that draws off liquid, typically from a container.
Think of someone or something that 'draws off' liquid — that's what a drainer does.