coinage
/ˈkɔɪnɪdʒ; `kɔɪnɪdʒ/ n
1 [U]
(a) making coins 造硬币.
(b) coins made 所造的硬币.
2 [U] system of coins in use （现行的）硬币币制
decimal coinage 十进位硬币币制.
3
(a) [U] inventing of a new word or phrase 创造新词语.
(b) [C] newly invented word or phrase 新创的词语
I haven't heard that expression before is it a recent coinage? 我以前从未听到过这个词语--是最近新造的吗?