US-P18.051ab ।US-P18.051cd ॥
In plain words
The meaning of the stem and the meaning of the ending are two different meanings, and yet they rest on one and the same thing. Look at a word like "he does" or "he goes": there it is, plain to see, on the strength of how everyone already speaks.
Close to the Sanskrit
The stem-meaning and the suffix-meaning, which two are distinct yet have a single substrate — just as in 'he does', 'he goes', and the like, the two are seen [to be so] from established usage in the world.