Face-down Defence Position refers to a monster card that is both:
No. You can have face up attack, face up defence, face down defence but not face down attack.
It's DEFENSE
Some monsters (like "Quilbolt Hedgehog") turn blue while in defensive mode in the 5D's anime to further contrast the visual appearances of attack and defense position monsters. Perhaps it was determined that it wasn't enough to show a monster crossing its arm, kneeling, etc.
Yes, this is what you normally do since you can't place them in face down attack position.
The core rules state that a Normal Summon places the monster in face-up Attack position, and a Set places it in face-down Defense position. Special Summons are face-up Attack or Defense position, unless stated otherwise. If the continuous Trap card 'Light of Intervention' is active, monsters can be Normal Summoned in face-up Defense position.
the face down defence position can special summon it also makes the opponent guess what that card is such as man eater bug
Faceup resting position, Facedown Position, and in a ball with a PFD.
If this card attacks a defense position monster your opponent controls, destroy all defense position monsters your opponent controls after damage calculation. During your end phase, destroy all of your monsters that did not declare an attack this turn.
It's DEFENSE
that's a negative, only cards that state their effects in face down defense mode like Big Shield Guardna
1 Tuner + 1 or more non-Tuner monsters If this card attacks a Defense Position monster your opponent controls, destroy all Defense Position monsters your opponent controls after damage calculation. During your End Phase, destroy all other monsters you control that did not declare an attack this turn.
When a monster attacks a defense position monster with DEF equal to to the attacking monster's ATK, no damage is inflicted to either player's Life Points and no monsters are destroyed in battle. Some monsters have effects that activate before or after they battle, so you must take those into account as well.
Defence Mode, or Defence Position, means that the card is placed Horizontally in the monster zone. It could also be Set (face down defence position) or face-up due to being Set and attacked, or switched while face-up from attack to defence.
A business in the defense position is defending its position within its industry. This can happen as a result of new entrants in the industry.
Some monsters (like "Quilbolt Hedgehog") turn blue while in defensive mode in the 5D's anime to further contrast the visual appearances of attack and defense position monsters. Perhaps it was determined that it wasn't enough to show a monster crossing its arm, kneeling, etc.
Yes, this is what you normally do since you can't place them in face down attack position.
the secretery of defense
The US Secretary of Defense is a position known as Defense Minister in other nations. It is a position appointed by the President and is by custom a member of the Cabinet.