井底之蛙

1. • a frog at the bottom of a well (idiom)

     lit.

2. • a person of limited outlook and experience

     fig.

Character by character

• 井(jǐng)Jing, one of the 28 constellations of Chinese astronomy
• 底(dǐ)bottom
• 之(zhī)(possessive particle, literary equivalent of 的 de)
• 蛙(wā)frog