1. A little bit at a time
   - piecemeal, bit by bit, in stages 
2. By a short distance
   - by inches, by small degrees

Encyclopedia: Little by little

• pollination
• pollinator
• polling booth
• polling day
• polling place
• polling station
• pollinium
• pollinosis
• polliwog
• pollock
• polls
• pollster
• pollucite
• pollutant
• genus Oenothera
• genus Oestrus
• genus Okapia
• genus Olea
• genus Oleandra
• genus Olearia
• genus Olfersia
• genus Oligoplites
• genus Oligoporus
• genus Ommastrephes
• genus Omphalotus