Rook in tree is knackered and goes to bed

• Goes out of business?
• Heads for bed
• Withdraws from active service
• Becomes superannuated
• Ballet movements
• Leaves the scene
• Calls it a career
• Stops using
• Hangs up one's spikes

Wiktionary Word definitions in Wiktionary
vb. (en-third-person singular of: retire )