二の腕
に
の
う
で
Meanings
1
Refers to the part of the arm from the shoulder to the elbow.
I do exercises to strengthen my upper arms.
She applied sunscreen to her upper arms.
2
lower arm
archaic
Archaic term for the forearm; modern Japanese uses 前腕 (ぜんわん) or 腕 (うで) for the lower arm. The archaic sense is preserved here for reference.
See also: 一の腕
In old texts, 二の腕 can refer to the forearm.