The Vietnamese phrase "ấp a ấp úng" is an idiomatic expression that describes a way of speaking or behaving that is hesitant or not straightforward. It often conveys a sense of uncertainty or indecision, similar to "fumbling" or "stammering" in English.
"Ấp a ấp úng" is a useful phrase to describe someone who is not expressing themselves clearly due to hesitation, uncertainty, or evasiveness.