Assimilation in pronunciation occurs when a sound takes on a feature of a neighboring sound. The change can involve where the sound is made, whether the vocal folds vibrate, or another property. It is a way to describe a relationship between nearby sounds, not a general instruction to imitate every sound around you. The linguistics textbook Essentials of Linguistics illustrates that languages can have different assimilation patterns, including changes in place and voicing. [1]
A sound borrows a feature
Imagine a phrase ending in /n/ followed by a consonant made with the lips, such as /b/. The tongue tip forms /n/, while the lips form /b/. In some speech patterns, the nasal can be produced closer to the lips, making it resemble /m/ before that /b/. The nasal remains nasal, but its place of articulation shifts toward the next consonant. That is a simple illustration of regressive assimilation: a later sound influences an earlier one.
Assimilation can also work in other directions or involve other features. The textbook gives examples from languages in which consonants change voicing or place in specific environments. [1] The exact rule belongs to the language or variety being described; one example cannot be generalized to all speech.
Direction and feature matter
The labels help specify what is happening. Regressive assimilation means a sound is influenced by one that follows it; progressive assimilation means influence goes from an earlier sound to a later one. Place assimilation concerns where in the vocal tract a sound is made. Voicing assimilation concerns whether vocal folds vibrate. Nasality assimilation concerns whether airflow resonates through the nose.
These are analytical descriptions. In ordinary listening, a change may be subtle, and speakers may vary depending on speed, emphasis, and style. The International Phonetic Alphabet can record sound distinctions with a shared set of symbols, but a transcription is only as detailed as its purpose requires. [2] For practical learning, you can notice the direction and feature without memorizing a full rule notation.
Do not confuse a change with a join
Linking makes neighboring sounds flow together, but does not necessarily alter either sound’s quality. Elision omits a sound. Assimilation changes a sound so that it resembles a neighbor in some respect. These processes can overlap in fast speech, which is why a phrase may be difficult to classify from casual listening alone.
For example, in the made-up phrase “ten bags,” say the final /n/ and then the /b/ carefully. Next, repeat the phrase more fluidly and notice whether the tongue position for /n/ moves toward the lips in anticipation of /b/. You may hear or produce a more /m/-like nasal, or you may not. Either outcome is useful data about your pronunciation; it is not a test with one required answer.
A small listening investigation
Make three recordings of “ten bags” and “green boat.” In the first, speak slowly and keep the word boundary clear. In the second, use your ordinary speaking pace. In the third, put emphasis on “bags” and “boat.” Listen to the nasal before each initial /b/. Is it unchanged, shifted, or simply difficult to hear? Compare the two phrases and note any difference.
If you are studying another speaker, do not rely on spelling alone. Listen to the audio, then use broad phonetic notes such as “nasal closer to lips before b.” You can consult IPA symbols when a precise transcription matters. The IPA chart is maintained by the International Phonetic Association as the standard reference for its alphabet. [2]
Pattern, not mistake
Assimilation is common across languages, but its specific patterns differ. A pronunciation shift that is expected in one language may not occur in another. Within English, speakers and accents also differ, and a careful reading may preserve a distinction that relaxed conversation weakens. This variation is part of how speech is produced, not evidence that a speaker is careless.
When practising, aim to understand the mechanism first. Use a few original phrases, compare careful and natural versions, and observe whether one feature spreads from one sound to another. You can then decide whether that pattern is useful in your own speech or simply helpful to recognize in someone else’s.
