noun
braggart; boaster; conceited person
Rare term for a person who is extremely self-conceited and boastful, likened to a tengu. Not commonly used in modern everyday speech.
彼は増長天狗のように自分の手柄ばかり話す。
He talks only about his own achievements like a conceited braggart.
Compound of 増長 (ぞうちょう, 'growing conceited') and 天狗 (てんぐ, 'tengu'), a mythical creature often depicted as arrogant and boastful. The exact historical derivation is uncertain, but the word figuratively describes a person whose conceit has grown to resemble that of a tengu.