This is often an intensive development of the basic lexical meaning.
The conceptual or lexical meaning is sufficient for its indexical purpose on this occasion.
This stem carries the basic lexical meaning of the verb.
This is often an extensive or causative development of the basic lexical meaning.
Hence, even without lexical meaning, the sentence can be said to be rather "meaningful".
This determines the basic lexical meaning of the verb.
This point is more obvious still with those names like Sarah and London which have no lexical meaning of their own.
Kinship terms may also, of course, be used with a lexical meaning like other nouns.
Some roots are used for grammatical functions (such as those that take part in the rules above), while others have lexical meanings.
However, not all word sentences suffer from this loss of lexical meaning.