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

Derived forms: hitting it off, hit it off

• killer T cell
• killer whale
• killick
• killifish
• killing
• killing field
• killing zone
• killingly
• killjoy
• killock
• kiln
• kiln-dried
• kilo
• kilobit
• kilobyte
• kilocalorie
• kilocycle
• kilocycle per second
• kilogram
• kilogram calorie
• kilogram-meter
• kilogram-metre
• kilogramme
• kilohertz
• kilojoule