"Turn back" is a phrasal verb commonly used in both informal and formal contexts, though it tends to appear more frequently in informal settings. Typically, it is employed when discussing physical movement and refers to the act of reversing direction to return to a previous location. For example, someone might say, "We had to turn back because the road was blocked," indicating they decided to return to their starting point after encountering an obstacle. It can also metaphorically imply abandoning or reconsidering a plan, decision, or course of action, as in "He decided to turn back on his decision to quit." The usage of "turn back" extends to safety advisories and guidance, particularly in navigation and travel scenarios, where it suggests recalling or revoking a course to ensure safety or reconsider an unwise move. This phrasal verb is relatively straightforward, and its meaning is generally clear from the context in which it is used.
B1
PreIntermediate
1. To move in the opposite direction from which you were heading.
We realized we were going the wrong way, so we had to turn back.
After reaching the dead end, they decided to turn back and find a new path.
2. To cause someone to move in the opposite direction or prevent someone from entering.
The guard turned them back at the gate because they didn't have tickets.
Police turned back hundreds of people trying to access the closed area.