半桶水

1. • (of one's skills, knowledge etc) limited

     coll.

2. • superficial
3. • half-baked
4. • sb with a smattering of knowledge (of sth)
5. • dabbler

Character by character

• 半(bàn)half
• 桶(tǒng)bucket
• 水(shuǐ)surname Shui