In his Oscar-nominated performance in “CODA,” Troy Kotsur has one spoken line, but it’s a good one. Urging his daughter, played by Emilia Jones, to pursue her dreams of singing and attending college, he says aloud: “Go!” 

For Kotsur, that one line meant lots of rehearsal plus the courage to, on a film set, speak dialogue he couldn’t himself hear. But Kotsur had also done it before. Years before, as Stanley Kowalski in a Deaf West Theatre production of “A Streetcar Named Desire,” he exclaimed “Stella!” night after night.

“Sometimes I’ll ask hearing audience members what my voice sounds like,” signs Kotsur. “One person described it as feeling like being cozy and tucked in bed.”

Kotsur, who does indeed radiate a rumpled warmth, is just the second actor who is deaf to be nominated for an Academy Award. He was also the first deaf actor to be named outstanding performance by a male actor in a supporting role at the Screen Actors Guild Awards.

And like that “Go!” the 53-year-old Kotsur hopes his achievement resonates with inspiration.

“I hope that young people who happen to be deaf or hard of hearing can get an increased confidence and be inspired that they can pursue their dreams,” Kotsur says. “I want those kids to not feel limited.”

The Apple TV+ release “CODA,” Sian Heder’s best-picture nominee, has elevated Kotsur to Hollywood’s biggest stages while making history for the deaf community. The rush of accolades has been discombobulating. When he was nominated for a BAFTA, he celebrated so much he fell out of his chair. Accepting the Gotham award for best supporting performance, he told the crowd that he wasn’t speechless but “absolutely handless right now.”

“It’s just overwhelming,” Kotsur says of the acclaim. “It’s awesome. I feel like I can die happy, with a smile on my face.”

The only one to ever go through something similar was Kotsur’s “CODA” co-star Marlee Matlin. In “CODA,” they play the parents of a deaf Gloucester fishing family with a hearing daughter. Kotsur remembers watching Matlin become the first deaf actor to win an Oscar, in 1987 for “Children of a Lesser God.”

“I felt like I could have hope as a deaf actor,” Kotsur remembered in an interview by Zoom from his home in Mesa, Arizona, through an interpreter. “Of course, I didn’t realize what a tough journey it would be going through show business.”

Kotsur’s long road to the Oscars began, he figures, in elementary school. With little TV programming accessible to him, Kotsur loved highly visual cartoons like “Tom and Jerry” and would animatedly retell them to his deaf classmates on the bus. His father, a police chief, would later fondly call Kotsur a “risk taker” for pursuing performing. He studied acting at Gallaudet University, and then toured with the National Theatre of the Deaf.

With few opportunities in television and film available for deaf actors, Kotsur found freedom on the stage. Beginning with “Of Mice and Men” in 1994, Kotsur has acted in some 20 productions at Deaf West, the nonprofit Los Angeles theater company founded in 1991. In one show, he met his wife, the actress Deanne Bray. He played Cyrano de Bergerac and starred in “American Buffalo.”

DJ Kurs, director of Deaf West, remembers first being “utterly drawn in by Kotsur’s magnetism” in “Streetcar.” Many times since, he’s seen Kotsur’s immersive process close up.

“Working with him in rehearsal is like being in the presence of a mad scientist,” Kurs said by email. “He’s always tinkering and fine-tuning, bringing in different elements of the character. This process doesn’t end until the moment the curtain goes up on opening night.”

On stage, Kotsur honed the full-body physicality of his acting. “It’s really important for me on stage to show emotion through sign language,” says Kotsur. “Sometimes, sign language can be more three-dimensional and meaningful than spoken dialogue.”

Heder first saw Kotsur in a pair of Deaf West plays: “At Home in the Zoo” and “Our Town.”

“And they were very different characters,” she said. “He’s so charismatic, especially on stage. He’s just got this amazing presence and he’s so funny.”

Kotsur had long been used to seeing one-dimensional and victimized deaf characters, but “CODA” presented something he had rarely seen. The Rossis of “CODA” may have to work a little harder but they’re a family like any other, with funny dinner-table conversation and casual bickering. Kotsur’s Frank is also a little randy and a little profane. In one scene in which he instructs his daughter on safe sex, he mimes a soldier putting on a helmet.

Kotsur, long accustomed to hearing actors curse, delighted in Frank’s vulgarity; he proudly recalls the film’s back-and-forth with the MPAA after “CODA” nearly received an R-rating. But to Kotsur, Frank is like a real deaf person — “a hard-working deaf person that just makes it through.”

“I want the audience to have a different perspective. I want them to get rid of their preconceived notions of what deaf people are like,” says Kotsur.