Sentence:  As already stated, there is a natural mechanism in most Class III cases that compensates for the sagittal skeletal discrepancy, so that during growth a <WSD>lingualization</WSD> of the mandibular incisors develops together with a vestibularization ... 
Meaning of the word marked with <WSD> tags:  The procedure of moving teeth towards the tongue side of the arch.<ref>[https://support.clearcorrect.com/hc/en-us/articles/204519157-Arch-Movements "Lingualization section" in Clear Correct.]</ref>