prepare
庤 centers on making something ready: preparing, arranging, or setting up in advance.
庤 combines 广 (building or roof) with 寺, which likely contributes the sound. The exact historical development is uncertain, but the structure suggests a place or action related to preparation.
Under a roof (广), a temple (寺) is being prepared for a ceremony. The scene of setting up the temple space helps remember 'prepare'.
For チ, imagine preparing a cup of tea (茶, ちゃ) under the roof. The 'cha' sound is close to チ, and the preparation ties to the meaning.