mechanicalfish
nounUK /mɪˈkænɪkəl fɪʃ/
US /məˈkænɪkəl fɪʃ/
A mechanical fish is a toy fish that moves by itself like a little machine.
My little brother played with a mechanical fish in the bathtub.
OTHER MEANINGS
2. A robotic device built to swim and move like a real fish.
Scientists made a mechanical fish to study how real fish swim.
3. A fish-shaped machine used for underwater exploring or spying.
The mechanical fish sent pictures from the bottom of the sea.
4. A pretend fish that looks real but is not alive.
The mechanical fish in the pond fooled everyone at first.