One of these days, is none of these days. |
One swallow does not make a summer |
One who sits between two chairs may easily fall down. |
One who walks in another's tracks leaves no footprints. |
One who wants to keep their yard tidy does not reserve a plot for the weeds |
One's best fortune, or, their worst is their spouse. |
Only fools and horses work |
Only the strong survive |
Only three things in life are certain birth, death and change |
Open up a can of worms |
Opportunities may come but they never linger. |
Opportunities neglected can never be recovered. |
Opportunity makes the thief |
Opportunity only knocks once |
Opportunity seldom knocks twice. |