English Expression · Intermediate
black box
A device in a vehicle, such as a train or ship, that records information about its operation
Pronunciation: /ˌblæk ˈbɒks/
Meaning
A device in a vehicle, such as a train or ship, that records information about its operation.
Example
The train's black box recorded its speed before the incident.
The train's black box recorded its speed before the incident.
Practice tips
- Practice black box out loud — read the pronunciation guide above and repeat.
- Use it in your own sentence today; reuse beats rereading.
- Pay attention to context: this English expression is for intermediate-level learners.