1.
extra serving of noodles
an additional serving of noodles added to ramen broth, typically offered at ramen shops after the customer finishes the first portion
2.
substitute; stand-in; body double
a person who takes another's place, often for deceptive purposes such as taking an exam for someone else
Forms
替え (replacement) + 玉 (ball, portion) → replacement portion
Sense 1 - ramen culture
Originating from Hakata/Fukuoka-style tonkotsu ramen, 替え玉 allows customers to order more noodles to add to remaining broth. The thin, straight noodles used in Hakata ramen are designed for this system.
Typical prices: 100-200 yen per serving, sometimes free.
Sense 2 - substitution
This sense has negative connotations, as it typically refers to fraudulent substitution:
Usage
In ramen contexts, the word is entirely positive and common. In other contexts, it implies deception.
Related Words
Compare:
身代わり (substitute)