lengthen-v; 1 Senses

Sense Number 1: make or become longer

NOTE: includes both physical and temporal measurements

They staged an unplanned sit-in that grew bigger and bigger as it lengthened to 32 hours.
One of the original runways constructed in 1929, this concrete runway was lengthened to 3500 feet.
The world-famous golf course is being dramatically lengthened to keep pace with equipment technology.
Trains will be lengthened to accommodate additional riders to both airports.
His stride lengthened to a dead lope.

VerbNet: other_cos-45.4
FrameNet: Expansion,Cause_expansion
PropBank: lengthen.01
WordNet 3.0 Sense Numbers: 1, 2