Related Clues:

• Betray surprise
• Haunted house sound
• Make the first move
• Onset
• Dive in
• Many solvers do it here
• Cry of terror
• Brief shock
• Get cracking
• All the clues in this puzzle do this with 36-Across
• Get the ball rolling
• Found
• Button word, sometimes
• Sound of horror
• Square on many board games