Related Clues:

• Inaugurate
• Inhalation
• Appear unexpectedly
• Display shock
• Take the first step
• Institute
• Windows button
• Go ahead
• [You don't mean …!]
• Jerk one's knee, perhaps
• Zero hour, e.g.
• Get the show on the road
• Say ''ouch!'' when pinched, e.g.
• Indicate shock
• Punch back instinctively