Does 'hold forth' refer only to speaking?

[Gabi]

English Idioms and Expressions, Intermediate level

ESL/EFL Test #7 "Hold on", question 9

Once he starts to talk about his favourite subject, he will hold forth until he is stopped.

(a) speak loudly
(b) speak quickly
(c) speak endlessly
(d) speak slowly

English Idioms and Expressions, Intermediate level

ESL/EFL Test #7 "Hold on", answer 9

Once he starts to talk about his favourite subject, he will speak endlessly until he is stopped.

Correct answer: (c) speak endlessly
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Does 'hold forth' refer only to speaking?

Thank you
Gabi

[Mister Micawber]

.
It has another meaning, which is not appropriate here:

hold forth:
a. to extend or offer; propose.
b. to talk at great length; harangue.

In b, it essentially refers to speaking, though usually a good deal of gesticulation is also involved.
.
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Native English teacher at Mister Micawber's