undies

und(erwear)  +‎ -ies.

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undies pl (plural only)

1. (informal) underwear, underpants
   • 2004, T. Fulton, Da Joka: Frisco’s Finest, page 59:

     I hope so because I can't wear the suit without the shirt. I went to go look in my dresser. I found it and got out my undies and socks.

   • 2020, Alex Garcia, Psst! Homie!:

     Some of us prevent this needless chaotic surge as we hand-wash our uniforms in our sinks or while we shower and, especially, our undies because in this way we are sure of its soapy cleanliness, chlorine scent, microbe safe and heartfelt snuggly sporty.

• BVDs
• drawers
• gotchies (Canada)
• gruds (New Zealand)
• knickers (UK)
• pants (UK)
• panties
• Reg Grundys (Australia)
• skivvies

undies

2. third-person singular simple present indicative of undie

• indues, nudies