covert allusion

See: hint
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Covert allusion to the Castlehaven scandal might also, however, bring to mind another celebrated instance of alleged sexual deviance, and one which would have been of particular interest to the author of 'Tis Pity She's a Whore.
By a subtle, complex linkage of small-scale, overtly casual actuality with myth and history, poets can manage to raise presumably covert allusions to a resounding general context.
Two factors underline Melchiori's argument and the ensuing hypotheses: a Falstaff character appears in each of the six, and each play provides "open or covert allusions to" the Order of the Garter and its ostensible concern with issues of "Policy and Honor" (12).