Definitions

1. noun

a strip of fabric, especially a narrow one, used to bind something, especially a corset or a waistcoat

“The undertie was tightly wrapped around her waist to keep her dress in place.”

2. verb

to tie or bind something beneath or underneath something else

“The undertie the ropes beneath the heavy load to secure it.”

3. verb

to make an undergarment, especially a corset or a waistcoat

“The tailor undertied the corset to fit the customer’s body perfectly.”