Antonyms for the word "un-plug" include "plug-in," "connect," "join," "link," and "charge." These words have the opposite meaning to "un-plug," which means to disconnect or remove from a power source. When you plug something in or connect it, you are providing it with power or enabling it to communicate with another device. Similarly, when you join or link something, you are connecting it with another object or system. And when you charge something, you are replenishing its power supply. So, if you're looking for an antonym for "un-plug," these words are excellent alternatives to use.