lookout
 
Chalabala/iStock Editorial/Getty Images Plus/GettyImages

SMART Vocabulary: related words and phrases

Protection and protectors
adopt
adoptable
aegis
anti-shark
anti-skid
chaperone
cybersecurity
defence mechanism
den mother
doorkeeper
elder care
preservationist
rewilding
ring-fence
safe space
safeguarding
safekeeping
weatherstripping
white knight
witness protection

You can also find related words, phrases, and synonyms in the topics:

Soldiers & people who fight in wars

sentry | American Dictionary

sentry
noun[ C ]
us/ˈsen·tri/
a soldier who guards a place and prevents those who are not allowed in from entering:
Sentries stood guard at the palace.

Examples of sentry

sentry
Discovering an unpredicted sentry(s) while moving along the created path can be easily accommodated.
At each free-space cell, the visibility risk cost to each sentry observing that cell is calculated.
The calculated visibility cost of that sentry at each affected cell is added to the previously stored cost.
The robot is exposed to the sentry at a far distance where it is more covert than the other shortcuts to the goal.
The new path is hidden from the known sentry but is still cautious from the unknown ones, as compared to the short path.
The approach has shown its capability of adapting with different levels of knowledge about both the operating environment and the sentries' locations.
This ability is important as it allows the robot to immediately maintain its covertness once it gets in the view field of an unpredicted sentry.
The estimated value at any location represents the risk level of being exposed to one or more sentries.
The approach depends on estimating a cost value at each free-space location that presents the risk of being seen by any sentry.
The shortest path on the other hand is exposed to all sentries.
It's in the middle of their line, like a sentry standing guard.
Only the cells that are in the view field of the discovered sentry are updated in the visibility map.
Different applications would have different visibility risk factors that should be taken into account, other than simply being/not being observed by a sentry.
The final visibility cost at a cell would be the sum of all visibility costs calculated for each of its observing sentries.
A short (dashed-line) path is observed by one of the sentries.
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.