order
誂 centers on placing an order or making a request, especially for something custom-made or specially arranged.
誂 combines 言 (speech) with 兆, which likely contributes the sound and may suggest a sign or omen, together conveying the idea of ordering or requesting through words.
Words (言) beside a sign or omen (兆) suggest speaking to arrange something in advance: placing an order.
For チョウ, imagine a tailor named Chou taking your order for a custom suit: Chou -> チョウ, and your words (言) specify the details.