古
gǔ HSK3

old

Original meaning: firm, solid

Composed of 盾 (shield) and the distinguishing mark 口. Based on the original meaning "firm, solid", now written as 固. The current meaning "old" is a phonetic loan.

Components

盾
盾 Iconic component
dùn shield

A shield is a firm object.

Change in form
Due to historical stylistic changes, this component is less similar to 盾 than it was in ancient scripts.
口
口 Distinguishing component
kǒu, kou mouth

The distinguishing mark 口 is sometimes used to indicate an abstract meaning taken from a concrete object. Here, the concrete object "shield" evokes the abstract meaning "firm, solid".

Character Evolution

Oracle form
Oracle Bone ~1250-1000 BC
Oracle form
Oracle Bone ~1250-1000 BC
Bronze form
Bronze Early Western Zhou ~1000 BC
Bronze form
Bronze Mid Western Zhou ~900 BC
Bronze form
Bronze Mid Western Zhou ~900 BC
Bronze form
Bronze Late Warring States ~250 BC
Seal form
Seal Warring States (Chu) 475-221 BC
Seal form
Seal Warring States (Chu) 475-221 BC
Seal form
Seal Shuowen ~100 AD
Seal form
Seal Shuowen ~100 AD
Clerical form
Clerical Qin 221-206 BC
Clerical form
Clerical Western Han 202 BC-9 AD
Clerical form
Clerical Eastern Han 25-220 AD
Regular Modern

Component uses

Sound (7 of 27 verified)

故苦居胡固姑估枯咕辜沽骷轱钴祜鸪蛄诂牯嘏怙岵罟酤鴣鈷軲

Meaning (1)

固

Historical Pronunciations

Middle ChineseOld ChineseGloss
Baxter-SagartkuXkˤaʔ ancient

說文解字

《說文》：“古，故也。从十口。識前言者也。，古文古。”

Sources

Character origin
季旭昇《說文新證》p.154
Readings & variants
Unicode
Historical pronunciations
Baxter-Sagart
Historical images
Academia Sinica
Etymology
Shuowen Jiezi (說文解字)