An ambush or surprise attack, especially from hiding in bushes; also, a hidden encampment in the bush.
From 'bush' + '-ment' (suffix forming nouns, from Latin '-mentum'). The '-ment' suffix creates abstract nouns from verbs and adjectives, as in 'movement,' 'judgment,' and 'astonishment.'
The '-ment' suffix (from Latin) is one of English's most sophisticated word builders—it often sounds formal or important, which is why we prefer 'government' to 'governing' or 'monument' to 'monumental thing,' showing how suffixes carry psychological weight.
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