Oil and water don´t mix
Old soldiers never die
Once bitten, twice shy
One funeral makes many
One good turn deserves another
One hand for oneself and one for the ship
One man´s loss is another man´s gain
One man´s meat is another man´s poison
One man sows, and another reaps
One man’s trash is another man’s treasure
One rotten apple spoils the barrel
One step at a time
One swallow does not make a summer
One volunteer is worth two pressed men
One year´s seeding makes seven years
Only the wearer knows where the shoe pinches
Opportunity seldom knocks twice
Other times, other manners
Out of sight, out of mind
Out of the fullness of the heart the mouth speaks
Out of the mouth of babes
