in flagrante delicto
Definition from Wiktionary, the free dictionary
in flagrante delicto (not comparable)
Usage notes 
Also used in abbreviated in flagrante. Particularly used of sexual activity, as in “to be caught in flagrante”.
Anglicized form in flagrant delict also appears, but is significantly less common.
Derived terms 
in the act of committing a misdeed
while performing sexual activity
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