lengthen (v.)

• aggrandize
• amplify
• augment
• boost
• broaden
• build
• continue
• dawdle
• draw
• elongate
• enlarge
• exalt
• expand
• extend
• fatten
• hike
• hold
• increase
• inflate
• keep
• maintain
• maximize
• parlay
• perpetuate
• preserve
• procrastinate
• produce
• prolong
• protract
• pull
• pyramid
• raise
• retain
• strain
• stretch
• sustain
• tauten
• temporize
• tense
• thicken
• tighten
• up