Related Clues:

• Harden
• Become accustomed (to)
• Fight extinction, maybe
• Fix to suit
• Reconcile
• Accustom (to)
• Habituate
• Become hardened to
• Accustom to hardship
• Make usable
• Adjust accordingly
• Toughen up
• Fit in
• Tweak
• Make accustomed to