1. (informal) immediately develop a good friendly relationship (with someone)

Derived forms: hitting it off, hit it off

• penitentially
• penitentiary
• penitently
• penknife
• penlight
• penman
• penmanship
• Penn
• penn'orth
• penna
• pennant
• pennate
• Pennatula
• Pennatulidae
• penne
• penni
• penniless
• pennilessness
• Pennine Chain
• Pennines
• penning
• Pennisetum
• Pennisetum Americanum
• Pennisetum cenchroides
• Pennisetum glaucum