Brace noun - A structure that holds up or serves as a foundation for something else.
Pairs and brace are semantically related. In some cases you can replace term "Pairs" with "Brace", this nouns are similar.
Both words in one sentence
- Il Duce challenges all three saints with a brace of six handguns, firing them in pairs and then tossing each pair aside when empty.
Source: Guns Akimbo
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Google Ngram Viewer shows how "brace" and "pairs" have occurred on timeline