"lengthened" in the verb sense
1. lengthen
make longer
"Lengthen this skirt, please"
2. lengthen
become long or longer
"In Spring, the days lengthen"
"lengthened" in the adjective sense
1. elongated, extended, lengthened, prolonged
drawn out or made longer spatially
"Picasso's elongated Don Quixote"
"lengthened skirts are fashionable this year"
"the extended airport runways can accommodate larger planes"
"a prolonged black line across the page"
Source: WordNet® (An amazing lexical database of English)
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