straighten a bow, lamp stand
檠 centers on a tool that holds something straight or upright: a bow-straightening frame or a lamp stand. Both meanings share the idea of a supportive structure that corrects or maintains position.
檠 combines 木 (wood) with 敬, which likely contributes the sound. The character originally referred to a wooden frame for straightening bows, and later extended to a lamp stand.
The top component 敬 suggests respect or careful attention, and the bottom 木 is wood. Picture a respectful craftsman using a wooden frame to carefully straighten a bow, or a wooden stand holding a lamp upright.
For ケイ, imagine a wooden stand shaped like the letter K, holding a lamp: K -> ケイ, and the stand keeps the lamp straight.