Sidekick/ˈsaɪdkɪk/ Definition 1 of 3Pro Tip 1/3Not Interchangeable Don't confuse 'sidekick' with 'partner'; sidekicks have a more supporting role. He may help a lot, but he's not my partner; he's my sidekick. Pro Tip 2/3Less Capable Implication 'Sidekick' sometimes implies a less skilled individual, not just a helper. I'm not just a sidekick; I solved the case too! Pro Tip 3/3Affectionate Tone Though 'sidekick' can suggest inferiority, it's often used affectionately. My little brother's my sidekick; he follows me everywhere.