no-no

[noh-noh]

noun

Informal.

plural

no-nos, no-no's 

1. anything that is forbidden or not advisable, as because of being improper or unsafe.

   If you want to lose weight, rich desserts are a no-no.

Word History and Origins

Origin of no-no¹

1940–45, reduplication of no ¹

Related Words

• check 
• condition 
• constraint 
• control 
• curb 
• limit 
• regulation 
• restraint 
• rule 
• stipulation 
• stricture