Basic Guidelines For English Spellings
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See US English definition of flatten
See UK English definition of flatten
See Spanish definition of aplanar
1‘Tom flattened the crumpled paper’
roughen, make uneven
2‘he had trampled around and flattened the grass’
3‘tornadoes can flatten buildings in seconds’
4‘Flynn flattened him with a single punch’
5‘I flattened a drunken heckler with a couple of speedy put-downs’