1. Make longer
   "Lengthen this skirt, please" 
2. Become long or longer
   "In Spring, the days lengthen"

Derived forms: lengthened, lengthening, lengthens

Type of: grow, increase

Antonym: shorten

• highwayman
• Higi
• hijab
• hijack
• hijacker
• hijacking
• Hijaz
• hijinks
• hike
• hike up
• hiker
• hiking
• Hilaire Belloc
• Hilaire Germain Edgar Degas
• hilar
• hilarious
• hilariously
• hilarity
• Hilbert
• Hilbert space
• Hildebrand
• hilding
• hill
• hill myna
• Hillary