The phrase "drops anchor" is often used to describe the action of a boat or ship anchoring in a particular location. However, there are many antonyms to this phrase that convey different meanings. For example, instead of dropping anchor, a vessel might weigh anchor, which means to lift the anchor and depart. Another antonym could be drifting aimlessly, which suggests a lack of direction or purpose. Alternatively, a ship could dock or moor, which implies a more permanent resting place. Ultimately, the choice of antonym depends on the specific context and intention of the speaker or writer.