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pro·long

prolong

 
 
pronunciation:
pr lawng [or] pr lang
part of speech: verb
inflections: prolongs, prolonging, prolonged
definition: to add length to or make last longer.
One way to prolong a pet's life is to feed it well.
synonyms:
draw out, extend, lengthen
antonyms:
conclude, shorten
similar words:
drag out, maintain, spin out, stretch, sustain
derivations: prolonged (adj.), prolongation (n.)