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lengthen (v.)

late 14c., "to make longer," also "to grow longer," from length + -en (1). Related: Lengthened; lengthening. Earlier verb was simply length (c. 1300).

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Definitions of lengthen from WordNet

lengthen (v.)
make longer;
lengthen (v.)
become long or longer;
In Spring, the days lengthen
From wordnet.princeton.edu