overbrim

It seemed as if he held his heart in his hands, like a full cup that the least motion might overbrim.

Indeed, easily reading as 'esta mora'--literally, 'that Moorish woman' in Spanish--the Gothic queen's name already overbrims with Moorishness, even if that Moorishness is not physically visible (as was the case for most Moriscos, a great source of anxiety for early modern Spaniards).

This surface tension, as it is called, is the reason we can fill a glass so that it overbrims with water.