Scopper Gaban's full answer to Sanji's question of he possess Conqueror's Haki or not:
Sanji: Hey, old man, what about me?! Don't I have "Conqueror's Haki"?!
Gaban: You should have the potential...
Sanji: Really?!
Gaban: However, for some reason, you... harbor a dangerous self-deprecation*. You must become a "King" yourself too... if you truly want to make Luffy the "King of the Pirates"!!
TL Note: The Japanese term is "自虐" (jigyaku). It literally means "self-torture," but in this context, Gaban is saying that Sanji is being "self-deprecating" or "undervaluing" himself.
Sanji: Hey, old man, what about me?! Don't I have "Conqueror's Haki"?!
Gaban: You should have the potential...
Sanji: Really?!
Gaban: However, for some reason, you... harbor a dangerous self-deprecation*. You must become a "King" yourself too... if you truly want to make Luffy the "King of the Pirates"!!
TL Note: The Japanese term is "自虐" (jigyaku). It literally means "self-torture," but in this context, Gaban is saying that Sanji is being "self-deprecating" or "undervaluing" himself.

