Meaning of 負色 in Japanese

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Definition of 負色

いろ(iro) 【色】

(n) colour; color
complexion
英雄色を好む。
Who does not love wine, women and song; remains a fool his whole life long.
appearance; look
love; lust; sensuality; love affair; lover →Related words: 色仕掛け
kind; type; variety

ふ(fu) 【負】

しょく(shoku) 【色】

おい(oi) 【笈 ·負】

(n) wooden box carried on one's back to store items for a pilgrimage
あ、あれ？なんか・・・すっごい負のオーラを感じますよ？
E-eh? I somehow seem to feel a very threatening aura...

しき(shiki) 【色】