xià
under
Originally a small line or dot below a longer line, indicating "down". The vertical line was added to distinguish the character from 二 (two). Opposite of 上.
Evolution

Oracle script
(~1250-1000 BC)
Bronze script
Mid Western Zhou (~900 BC)
Seal script
Shuowen (~100 AD)
Clerical script
Eastern Han dynasty (25-220 AD)Regular script
ModernDefinitions
xià
under, underneath, below; down; inferior; bring down; downwards; below; lower; later; next (week etc); second (of two parts); to decline; to go down; to arrive at (a decision, conclusion etc); measure word to show the frequency of an action
Component uses
Meaning component in 1 character (0 verified)
Iconic component in 1 character (1 verified)
Sources