To treat someone with an apparent kindness that betrays a feeling of superiority. She felt insulted when he began to patronize her by explaining the basics of her own job.
To frequent a store, restaurant, or other establishment as a customer. They decided to patronize the local coffee shop instead of the big chain.
To act as a patron to; provide support, sponsorship, or protection for someone or something. The wealthy businessman regularly patronizes young artists by funding their exhibitions.