Cooped up at Old MacDonald's

• Penned, as a pig
• Confined to a pen
• Penned up
• Put in a pen
• Kept in a pigpen
• Penned, as pigs
• Pent up in a pigpen

Wiktionary Word definitions in Wiktionary
vb. (en-paststy)

WordNet Word definitions in WordNet
See sty