‘Turn off’ is a popular phrasal verb with applications in professional and social English. To ‘turn something off’ can mean ‘to switch it off.’ You can ‘turn off’ electronic or mechanical items to stop them from working. To 'turn off' can also mean to leave or move away from a particular road, path, or route that you are travelling on. You can ‘turn off a road’ or ‘turn off the motorway’. When you are 'turned off by' something, it means you dislike it, lose interest in it, or are averse to it. It can also mean the opposite of being sexually excited or interested in someone.
Additional examples with 'turn off' are:
Your friend's car is making an unusual sound and you think you know how to help:
"If you turn off the engine, I will take a look under the bonnet to see what's wrong."
You are driving to town for the first time, and your brother has given you directions:
"My brother said the best route is to turn off the motorway at exit 18."
Someone is talking about how they ended up in their job:
"I always wanted to work as an archaeologist, but when I experienced the weather conditions and low job security, I was turned off the idea."