returnline
nounUK /rɪˈtɜːnlaɪn/
US /rɪˈtɜːrnlaɪn/
A return line is a tube or path that carries something back to where it started.
The water flows through the return line back into the tank.
OTHER MEANINGS
2. A line of text at the end of a document or form where you write your address to get a reply.
Please write your name on the return line of the envelope.
3. A railway track that lets a train go back the way it came.
The train switched to the return line to head back to the station.
4. In computing, a line of code that sends a value back from a function.
The programmer added a return line to give the answer back to the main program.