dài
replace
Phonosemantic compound. 亻 represents the meaning and 弋 represents the sound.
Evolution

Seal script
Shuowen (~100 AD)
Clerical script
Eastern Han dynasty (25-220 AD)Regular script
ModernDefinitions
dài
replace, replacement (of person or generation); era, generation; to substitute; to act on behalf of others; to replace; generation; dynasty; age; period; (historical) era; (geological) eon
Sources