noun, noun or participle which takes 'suru', intransitive verb
growing impudent; becoming arrogant; getting stuck-up
Describes a person becoming increasingly conceited or full of themselves, often due to success or praise. Used for negative personality change.
彼は最近成功して増長している。
He has been getting arrogant lately after his success.
少し褒めるとすぐ増長する
He's the type who gets stuck-up as soon as you praise him a little.
noun, noun or participle which takes 'suru', intransitive verb
becoming more severe; increasing (of negative things)
Used for undesirable things intensifying, such as pain, symptoms, or bad tendencies. Less common than sense 1.
病気の症状が増長してきた。
The symptoms of the illness have been getting worse.