verb

• (Christianity) To perform the sacrament of baptism by sprinkling or pouring water over someone or immersing them in water.
  "I vvas baptized in thy Cordiall vvater, againſt Original ſinne, and I haue drunke of thy Cordiall Blood, for my recouerie, from actuall, and habituall ſinne, in the other Sacrament."
• (figurative) To Christianize.
  "Ample evidence for this transfer of divine imagery can be found in early Christian times, when the Mother of God took over the titles, shrines, iconography and power of the great mother goddess of the Mediterranean world. This "baptizing" of pagan imagery was a successful missionary strategy that allowed Christianity to attract peoples accustomed to female deities while still maintaining faith in God as Father, Son and Holy Spirit"
• (archaic, slang) Of rum, brandy, or any other spirits, to dilute with water.
  "There's a good tavern nearby where they don't baptize liquor!"
• (slang) To ensure proper burning of a joint by moistening the exterior with saliva.