Those who knew him will recognize in my third act the allusion to the patent Shorthand in which he used to write postcards, and which may be acquired from a four and six-penny manual published by the Clarendon Press.
There are no more uses of "allude" in the play.
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He alluded to Susan without mentioning her name.
She didn’t mention any names, but everyone knew she was alluding to the President.