comulgar

Primarily a religious verb: to receive Communion in a Catholic Mass (comulgar en misa). By extension, comulgar con means to share or align with someone's ideas: comulgo con esa visión ("I'm in agreement with that view").

• Fueron a comulgar en la misa del domingo. — They went to receive Communion at Sunday Mass.
• No comulgo con esas ideas. — I don't subscribe to those ideas.
• Ella comulga todos los domingos. — She takes Communion every Sunday.

Learners often miss the figurative sense entirely — no comulgar con algo is a very common way to say "I don't agree with/buy into something," not just a statement about church attendance.

• expression "Comulgar con ruedas de molino" — A well-known fixed expression meaning to believe something utterly implausible or swallow an absurd lie — literally "to take Communion with millstones," playing on the absurd size contrast with the small Communion wafer. Some Latin American countries say ruedas de carreta instead.