Is there an L in both?

My grandmother was one of those speakers who had an r in the word wash, pronouncing it warsh. For her, the nation’s capital was Warshington, D.C., and the vegetable was a squarsh. That r-ful pronunciation is known as an intrusive r. I’ve got it too, though mine is variable. Sometimes I have an r in wash, washcloth, and Washington, and sometimes I don’t.

There is also something called the intrusive l, which occurs when someone pronounces the word both as bolth. You can also find the intrusive l in mouth and south, though that is less common. I noticed it in the speech of my students in the Pacific Northwest. Typically, about 15% of any given class pronounced both with an l. So what’s going on?

One possibility is that the l is a naturally occurring co-articulation. What does that mean? Well, notice how the o is a vowel produced in the back of the mouth, with the tongue at mid-height and the lips rounded. The b is also a sound made with rounded lips—a bilabial stop in the lingo. Your lips close the airflow and then open it to produce the buh-sound. Go ahead and make some b-sounds and o-sounds and bo-sounds.

The th of both (it’s a single consonant spelled with two letters) is what’s known as an interdental fricative. What that means is that the tongue goes between the teeth (hence the interdental part) in order to obstruct the airflow and create friction (hence the fricative part). Say the th-sounds a few times.

Well, what happens to your tongue as it moves from the back-rounded bo to the word-final –th? Say both slowly a few times and see what you notice your tongue doing. Do you notice how similar the tongue movements are for both and for bolth? For me, both has a slightly lower position of the tongue blade as it goes from bo to th, so perhaps the l-sounds of bolth comes from some speakers having a slightly raised tongue during that transition from bo to –th.

The intrusive r of warsh may have a similar genesis. The consonant r holds a special, quirky place in English phonetics and phonology. There is the historical r-lessness of southern England and of certain American dialects, the linking r that shows up in words like Cuba(r) and idea(r), and the syllabic r of words like bird, which is pronounced brd. The intrusive r of warsh seems to be its own thing, most common among older, rural speakers (and their grandchildren). There’s a back-rounded w and back vowel a followed by sh. Sh is a palatal fricative, meaning the friction is produced with the tongue approaching the hard palate (the front of the roof of your mouth). Along the route from back wa to palatal sh, your tongue makes a gesture close to an r. Try saying wash and then marsh a few times, and you’ll feel where your tongue is going. 

By the way, just as there is a linking r sound (as in Cuba(r) and idea(r)), there is also a linking l sound in some dialect areas of English (such that spa is is pronounced as spal is and drawing is drawling). The linguist Bryan Gick of the University of British Columbia has studied the emergence of such sounds in a 1999 article in the journal Phonology and a 2022 article in American Speech, and he shows how certain articulatory gestures can sometimes create the l-sounds and r-sounds. Gick also notes that “gestural overlap” is a likely cause of the r in warsh. The same, I think, can probably be said for bolth. 

My grandmother would approve.

^{Featured image by Merve Sehirli Nasir via Unsplash.}