O
Oath, to take the, [195]
Ogre, to eat like an, [157]
Old as the hills, [163], [191], [231]
Old birds not caught with chaff, [161]
Old dog will learn no tricks, [146]
Old-fashioned, quite, [146]
Old maid, [74]
Old wives’ tales, [78]
Once bit, twice shy, [63], [201]
Once in a blue moon, [163]
One door shuts, another opens, [184]
One good turn deserves another, [62], [146]
One man can take horse to water, [213]
One man may steal a horse, [166]
One man’s meat, [170]
One scabby sheep, [134]
One swallow does not make a summer, [86]
Only this once, [86]
Open confession good for soul, [26]
Opportunity makes the thief, [150]
Out-Herod Herod, [208]
Out of debt, out of danger, [95]
Out of print, [110]
Out of sight, out of mind, [73]
Out of the frying-pan, [47]
Out of world as out of fashion, [130]
Over head and ears, [87]