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third-person singular simple present lengthens, present participle lengthening, simple past and past participle lengthened
(transitive) To make longer, to extend the length of. quotations examples
The platforms of all stations from Shepherds Bush to Liverpool Street have been lengthened from 325 ft. to 427 ft. between tunnel headwalls, to take longer trains.
1950 September, “Central London Railway Jubilee”, in Railway Magazine, page 622
(intransitive) To become longer. examples