Rasarnavasudhakara 1.327

For example:
"At the words of the nurse, pregnant with suggestive undertones,
blushing with shame, accompanied for a moment by an angry smile,
she joined the pair of dolls
as in-laws belonging to her female confidante."

Here, because the modifications of the mind—anger, joy, modesty, and so forth—are slightly manifested by side glances, a smile, a bent face, and the like, this is flirtatious gesture.