A small bush or a young, small tree (archaic/dialect).
Diminutive of 'bush' using the '-et' suffix, which creates small versions of words (like 'packet' from 'pack'). This is an older English term less commonly used today.
Medieval writers used 'bushet' in poetry to describe tiny plants and saplings, and the word shows how English used to be much more playful with diminutive suffixes.
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