cross swords

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb Used other than as an idiom: see cross,‎ sword., to place or hold two swords so they cross each other.
• verb To fight with someone; to duel.
• verb idiomatic To quarrel or argue with someone; to have a dispute with someone.
• verb idiomatic, vulgar For males, to urinate simultaneously such that the streams intersect.