1. Red flag
When something raises a red flag, it means it is a cause for concern or suspicion. For example, if a passenger’s behavior seems suspicious, it could raise a red flag for the customs inspector.
2. Tip of the iceberg
This idiom is used to describe a situation where the visible part is just a small portion of a larger, more complex issue. For instance, if a customs inspector discovers a small amount of contraband, it could be just the tip of the iceberg, indicating a larger smuggling operation.
3. In the clear
Being in the clear means being free from any suspicion or danger. If a passenger’s luggage passes all the necessary checks, they can be considered in the clear.
4. Fishy
When something seems fishy, it means it appears suspicious or not quite right. If a customs inspector notices inconsistencies in a passenger’s story, it might seem fishy.
5. Tight ship
Running a tight ship means maintaining strict control and order. A customs inspector needs to run a tight ship to ensure the smooth operation of the customs process.
6. Off the radar
When something is off the radar, it means it is not being monitored or noticed. If a suspicious package goes off the radar, it could pose a potential threat.
7. On the ball
Being on the ball means being alert, attentive, and quick to respond. A customs inspector needs to be on the ball to identify any potential security risks.
8. Under the radar
Similar to off the radar, under the radar means going unnoticed or undetected. Smugglers often try to operate under the radar to avoid detection.
9. Catch red-handed
To catch someone red-handed means to catch them in the act of doing something wrong or illegal. If a customs inspector catches a passenger with prohibited items, they are caught red-handed.
10. Call it a day
This idiom is used to indicate that a task or activity is finished or completed. After a long day of inspections, a customs inspector can finally call it a day.