Which term refers to a liquid sound being replaced with a glide?

The term that describes a liquid sound being replaced with a glide is gliding. In speech sound development, liquids are sounds produced with a relatively open vocal tract, such as /l/ and /r/, while glides are produced with a partially open vocal tract, like /w/ and /j/. For instance, a child might replace the liquid sound /r/ with the glide /w/, resulting in "wabbit" instead of "rabbit." This phenomenon is commonly observed in younger children as they develop their articulation skills and typically resolves as they mature.

Fronting refers to a process where back sounds are produced as front sounds, voicing involves changes in the voicing of consonants, and total deletion indicates the omission of sounds altogether. These terms, while related to phonological processes, do not accurately describe the specific substitution of a liquid sound with a glide. Thus, gliding is the appropriate term for this substitution process.