| GU | protect against a challenge or attack |
|---|---|
| GU | to keep watch over |
| GU | take precautions in order to avoid some unwanted consequence |
| GU | a boat that is on guard duty (as in a harbor) around a fleet of warships |
| GU | a dog trained to guard property |
| GU | the duty of serving as a sentry |
| GU | coarse hairs that form the outer fur and protect the underfur of certain mammals |
| GU | an escort for a distinguished guest or for the casket at a military funeral |
| GU | a warship (at anchor or under way) required to maintain a higher degree of readiness than others in its squadron |
| GU | the car on a train that is occupied by the guard |
| GU | (heraldry) looking forward |
| GU | prudent |