Sometimes a word by itself isn't clear as a gloss. For example, the English word "fly" could refer to an insect, to the way a bird or insect moves by flapping its wings, to the way an airplane moves, or to the zippered flap on a pair of trousers. Most sign languages have different signs for each of these meanings. So, to make it clear what a sign means, dictionary writers often add a clarifying comment in parentheses after a gloss.
It also helps to have good example sentences that make the meaning clear. These example sentences, for example, contrast driving with flying. They make it clear that the sign talks about a way for people to travel in an airplane.
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