打底

1. • to lay a foundation (also fig.)
2. • to make a first sketch
3. • to eat sth before drinking
4. • to apply an undercoat

Character by character

• 打(dǎ)a semantically light, transitive verb that is combined with various grammatical objects to form compound verbs and verb-object phrases with a diverse range of meanings
• 底(dǐ)bottom