Related Clues:

• Show off your guns
• Tighten, as muscles
• Work one's biceps
• Give, as effort
• Show off one's muscles
• Put forth, as strength
• Bend, as muscles
• Bend one's elbow, e.g.
• Bend, as an elbow
• Like variable work time
• Bring into use, apply
• Electric cord
• Bring to bear, perhaps influence
• Bring into use, say strength
• Bring quality or influence into play