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
替え玉をお願いします。
Extra noodles, please.
この店は替え玉無料だ。
This shop offers free extra noodles.
博多ラーメンは替え玉で有名だ。
Hakata ramen is famous for its extra noodle system.
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
試験で替え玉を使うのは犯罪だ。
Using a substitute to take an exam is a crime.
替え玉受験で逮捕された。
He was arrested for having someone else take the exam in his place.
彼は替え玉を立てて出席したふりをした。
He used a stand-in to pretend he was in attendance.
FORMATION:
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:
- 替え玉受験 (proxy exam-taking)
- 替え玉出席 (proxy attendance)
NUANCE:
In ramen contexts, the word is entirely positive and common. In other contexts, it implies deception.