What is another word for becoming speechless?
Pronunciation: [bɪkˈʌmɪŋ spˈiːt͡ʃləs] (IPA) 
There are many synonyms for the phrase "becoming speechless". Some of these include being tongue-tied, dumbstruck, lost for words, tongue-tangled, at a loss for words, stammering, and faltering. These phrases are all commonly used to describe moments when we find ourselves overwhelmed with emotion or taken by surprise, leaving us temporarily unable to find the words to express ourselves. Feeling speechless can be both a positive and negative experience, depending on the context. It can be a moment of profound reverence or admiration, or it can be a moment of confusion, fear, or anxiety. Regardless of how it's experienced, there are plenty of words to describe this common phenomenon.
