Directions: Select the most appropriate meaning of the given idiom.

Lock horns

The correct answer is Engage in a fierce argument or disagreement.

Explanation:

The idiom "Lock horns" originates from the behavioral metaphor of horned animals (such as bulls, stags, or rams) interlocking their horns when fighting over territory or dominance.

In everyday English, to "lock horns" figuratively means to get involved in a intense conflict, argument, or clash of opinions with another person.

Option Analysis:

• Reach a mutual agreement quickly: Incorrect. "Locking horns" signifies collision and dispute, not finding common ground.

• Cooperate peacefully on a joint venture: Incorrect. The idiom implies confrontation and opposition, which is the opposite of peaceful collaboration.

• Engage in a fierce argument or disagreement: Correct. This accurately describes entering into a heated conflict or dispute.

• Share equal workplace duties: Incorrect. Sharing responsibilities is unrelated to combat or argument.