Vividness and idiom
Doubling a verb = 'a little / give it a try'.
AA or AABB patterns make description vivid.
| Type | Pattern | Example |
|---|---|---|
| verb | AA / A一A | 看看 / 看一看 |
| verb (2-syllable) | ABAB | 讨论讨论 |
| adjective | AABB | 干干净净 |
| adjective (1-syl) | AA | 红红的 |
Set four-character phrases carry cultural meaning.