![o-Toluidine][1] 

![o-Toluic Acid][2]



  [1]: https://i.sstatic.net/IrZpv.png  
 [2]: https://i.sstatic.net/nlLYy.jpg

When comparing $\ce{o,m,p-Toluidine}$, basicities, *Ortho Effect* is stated as a reason why o-toluidine is weaker  
But,  
When comparing $\ce{o,m,p-Toluic Acid}$ basicities, *Ortho Effect* is stated as a reason why o-toluic acid is stronger acid  
And,  
 I was given the definition that *Ortho Effect* is an effect in which an ortho- group causes steric hindrance, forcing the $\ce{-COOH}$ or $\ce{-NH2}$ or some other bulky group to move  out of the plane, inhibiting resonance.  
Then,  
If Ortho Effect inhibits resonance, why is $\ce{o-Toluic Acid}$ the strongest and $\ce{o-Toluidine}$ the weakest?  
If not, What exactly is Ortho Effect?