trailer bike
one-wheeled bicycle trailer that looks like "half a bicycle", designed to transport children in a seating position similar to a regular bicycle rider
en-GB/ˈtɹeɪlə ˈbaɪk/
en-US/ˈtɹeɪlɚ ˈbaɪk/
one-wheeled bicycle trailer that looks like "half a bicycle", designed to transport children in a seating position similar to a regular bicycle rider