vest-pocket
/ˈvestˈpɒkɪt/adjective
attrib.
1- N. Amer. (especially of a reference book) small enough to fit into a pocket〈北美〉（尤指参考书）袖珍的：
a series of popular vest-pocket dictionaries.
一套流行的袖珍词典。
1.1
- very small in size or scale很小的, 微型的：
a vest-pocket park.
小公园。