lòu
leak
Originally written as 屚, which depicts rainwater (雨) leaking through a house roof (屋). The 氵 (water) component was added later to clarify the meaning.
Components
Evolution

Seal script
Shuowen (~100 AD)
Clerical script
Western Han dynasty (202 BC-9 AD)
Clerical script
Eastern Han dynasty (25-220 AD)
Clerical script
Cao Wei (Three Kingdoms: 222-280 AD)Regular script
ModernDefinitions
lòu
leak, drip; funnel; hour glass; to leak; to divulge; to leave out by mistake; waterclock or hourglass (old)
Sources
李学勤《字源》p.1011, 1025
許進雄《新編進階甲骨文字典: 甲骨文發現120周年紀念版》p.204