noun
stand-in; substitute; double; ringer
Refers to a person or thing used as a replacement, often with a connotation of deception or secrecy, such as a body double, a proxy test-taker, or a decoy.
試験で替え玉を使うのは不正行為だ。
Using a stand-in for an exam is cheating.
彼は替え玉を使って会議に出席させた。
He sent a substitute to attend the meeting in his place.
noun
extra noodles; second serving of noodles
Specifically in ramen shops, a refill of noodles added to the remaining broth. Often ordered as 替え玉ください.
ラーメン屋で替え玉を頼んだ。
I ordered an extra serving of noodles at the ramen shop.
スープがまだあるので、替え玉をもらえますか？
There's still broth left, so can I get a refill of noodles?