Related Clues:

• On one's guard
• Like a good guard dog
• Just sitting there
• At a standstill
• Warning signal
• Put on notice
• Inactive
• Like a couch potato
• Vigilantly attentive
• Not out of it
• Not up to anything
• Without basis
• In a safe place
• Sitting on one's hands
• *Siren ... danger ... perked up