There are multiple interpretations as to the origin of 且. One of them is that 且 is a pictographic character of a stone altar or memorial tablet. 且 serves as a phonetic component to form characters.
Characters formed by the phonetic component 且
祖 组 阻 诅 珇 俎 靻 zǔ
趄 狙 疽 苴 砠 罝 菹 jū
怚 袓 跙 jù
咀 沮 龃 jǔ
蛆 伹 坥 岨 qū
殂 徂 cú
耝 刞 qù
租 蒩 葅 zū
粗 姐 助 笡 驵 cū jiě zhù qiè zǎng