his/her chair
El capitán de nave Ehlers se recostó en su silla y se acarició la barbilla.
Spaceship Captain Ehlers leaned back in his chair and stroked his chin.
Tom dejó el tenedor y empujó su silla hacia atrás.
Tom put down his fork and pushed his chair back.
He leaned back in his chair.
Caminaba por la casa, se sentaba en su silla, hablaba con su voz.
He walked around the house, sat in his chair, and spoke in his voice.
— Psicosis (1960)
Mary se desplomó sobre su silla.
Mary slumped into her chair.