tartamudear - to stutter, to stammerSpanish example: Cada vez que tartamudeaba veía en sus ojos la preocupación y la pena.
English example: Each time he stuttered I saw worry and shame in his eyes.
Source: tartamudear - to stutter, to stammer (https://www.123teachme.com/spanish_feeds/word_of_the_day/2021/3/12)