1. (verb) be vigilant, be on the lookout or be careful

• look out
• watch

1. (verb) be vigilant, be on the lookout or be careful

• beware
• mind
• keep one's eyes open
• keep one's eyes peeled
• keep one's eyes skinned
• look after

1. (verb) be vigilant, be on the lookout or be careful

• lookout
• outlook
• lookout
• lookout station
• observation tower
• observatory
• lookout
• observation post
• lookout
• lookout
• lookout man
• lookout man
• picket
• picket
• scout
• scout
• sentinel
• sentinel
• sentry
• sentry
• spotter
• spotter
• watch
• watch
• security guard
• watcher
• watchman