You may ask, How can a word be an antonym of itself? Through polysemy and homonymy, a word that is pronounced or spelled the same way can have opposite meanings. A word that is an antonym of itself is called a contronym.
A commonly known contronym one is dust (verb). The two opposite meanings of dust are:
1. remove fine particles: Please dust the drawers to keep them clean.
2. cover with fine particles: He dusted the cookies with sugar.
Seed (verb) is another one:
1. remove seeds from: Seed the watermelon before eating.
2. distribute seeds; to sow seeds
To "X" something is a phrase often used colloquially. Here are its opposite meanings:
1. select: X your desired items on the list.
2. cancel/eliminate: Please X out the items you don't want.
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