1, The full form of NSDD is 你说得对 (nǐ shuō dé duì; nsdd)

你说得对 (nǐ shuō dé duì; nsdd) means “what you said is right” and is generally used to endorse or approve of what someone has said.

For example:

• Nsdd！这样的做法是正确的。
• Nsdd! Zhèyàng de zuòfǎ shì zhèngquè de.
• Nsdd! That’s the right way to do it.

However, it can also be used to brush someone off by hastily agreeing with them if the speaker doesn’t wish to continue the conversation. For example:

• Nsdd, 都听你的。
• Nsdd, dōu tīng nǐ de.
• Nsdd, whatever you say.

2, The full form of NSDD is National Security Decision Directives

National Security Decision Directive 77 (NSDD-77; titled Management of Public Diplomacy Relative to National Security), was a U.S. National Security Directive signed on January 14, 1983, by President Ronald Reagan. The directive established a Special Planning Group (SPG) under the National Security Council (NSC) whose purpose was to strengthen, organize, plan, and coordinate public diplomacy of the United States relative to national security.^[1] This NSDD positioned the White House and the National Security Staff at the helm of public diplomacy coordination across government agencies. NSDD-77 lay the groundwork for the Reagan administration’s aggressive public diplomacy strategy and included guidance for inter-agency working groups to execute wide-ranging tactics for information dissemination both domestically and internationally.

A National Security Decision Directive (NSDD) is a kind of Presidential Directive in which a President gives instructions to senior advisors and departments concerning matters of national security