patronize

Concise Oxford English Dictionary © 2008 Oxford University Press:
patronize /ˈpatrənʌɪz/ (or patronise)

▶verb

• 1 (often as adj. patronizing) treat with an apparent kindness which betrays a feeling of superiority.

• 2 frequent (an establishment) as a customer.

• 3 act as a patron towards (a person, organization, etc.).

– derivatives
patronization noun,
patronizer noun,
patronizingly adverb.