All 6 Uses

forgery
in
The Wide Window
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"Well, we could do a forgery," Klaus said, using a word which here means "write something yourself and pretend somebody else wrote it."†
p. 66.2 *
She intended to tell him immediately of their forgery theory, but as soon as she saw him, standing in the doorway with a white handkerchief in one hand and a black briefcase in the other, her words stuck in her throat.†
p. 69.8
"Forgery?" he repeated.†
p. 72.1
"Forgery is a very serious charge," he said sternly, and blew his nose.†
p. 72.5
If you really think this note is a forgery, then we have to stop talking about disguises and do an investigation.†
p. 73.6
I was sure we were on the right track with the forgery idea.†
p. 78.4

Definitions:

(1) (forgery)
something that is represented as real even though it is a fake; or the making of such a fake item
(2) (meaning too rare to warrant focus)