All 4 Uses

illustrate
in
Growing Up, by Baker
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Rising from the table, Uncle Hal yanked his belt off to illustrate.
Chpt 8 *

illustrate = help make clear
One evening at supper he told a story illustrating his refusal to tolerate the insolence of the lower classes.†
Chpt 8
Eight or nine other students turned up, we took our seats, and a burly red-headed man sat on the parlor windowsill and illustrated the use of the banjo pick.†
Chpt 9
His talk was being illustrated with hand movements, as pilots' conversations always were, hands executing little loops and rolls in the air.†
Chpt 15

Definitions:

(1) (illustrate as in: as illustrated by this example)
to help make clear -- typically by example
(2) (illustrate as in: an illustrated children's book)
to draw pictures (or provide photographs) to accompany a book or other writing
(3) (meaning too rare to warrant focus)