noun
seating posture; way one sits
Refers to the manner or posture of sitting, often in formal or traditional contexts. Can imply composure or readiness.
彼は居住まいを正して話し始めた。
He straightened his sitting posture and began to speak.
茶室では居住まいが大切だ。
In a tea room, one's seating posture is important.
姿勢 is a general term for posture (standing or sitting), while 居住まい specifically refers to seated posture and often carries a nuance of formality or composure.
Compound of 居 (i, 'being, sitting') + 住まい (sumai, 'living, dwelling'). The reading いずまい is a sound shift from いすまい.