Compare Ugaritic 𐎖𐎌𐎚 (qšt), Akkadian 𒄑𒉼 (qaštum), Hebrew קֶשֶׁת (qéšeṯ), Ge'ez ቀስት (ḳäst), ቀሥት (ḳäśt), ቀስተም (ḳästäm), ቀስታም (ḳästam), Amharic ቀስት (ḳäst), Tigrinya ቀስቲ (ḳästi), Tigre ቀሽ (ḳäš).
Practice speaking and memorizing "قوس" and many other words and sentences in Arabic.