Related Clues:

• Stop order?
• 'That's enough!'
• 'Stop it!'
• Parental command
• 'Stop bugging me!'
• Cautionary advice
• Middle of the quip, with 37-Across
• 'Cut it out!'
• 'Quit it!'
• Word said with a hand-slap
• 1958 #1 Elvis Presley hit
• Amply
• Adequate
• 'Bad idea'
• Sufficient