ruò
weak
Original meaning:
urinate
Depicts two people urinating (尿). Based on the original meaning "urinate", now written as 尿/溺. The current meaning is a phonetic loan.
Evolution

Seal script
Shuowen (~100 AD)
Clerical script
Eastern Han dynasty (25-220 AD)Regular script
ModernDefinitions
ruò
weak; fragile, delicate; feeble; young; inferior; (following a decimal or fraction) slightly less than
Sources
季旭昇《說文新證》p.705