The idiom "To throw down the gauntlet" means "To issue a challenge." This phrase originates from medieval times, when a knight would challenge an opponent to a duel by throwing his gauntlet (a heavy, armored glove) at the other's feet. If the opponent picked up the gauntlet, it signified acceptance of the challenge.
In modern usage, the idiom is used metaphorically to describe any act of issuing a direct challenge or provocation, whether in a debate, competition, or conflict. For example, "The new company threw down the gauntlet to its competitors by launching an innovative product at a lower price." It implies a bold and confrontational act, inviting a response or contest. It does not mean to withdraw from a dispute, seek advice, or make peace, as these actions are contrary to the aggressive nature of issuing a challenge.