The initial idioms of the letter O

one over (the) eight	picture is worth a thousand words, one
puts (one's) trousers on one leg at a time (ju	one sandwich short of a picnic
one sandwich shy of a picnic	you saved the day
one side	one smart apple
one-star	one step ahead
one step at a time	One step forward, two steps back
one step forward and two steps back	one swallow does not a spring make
One swallow does not make a summer	one swallow does not make a spring
one swallow doesn't make a summer	one that got away
one thing after another	one thing leads to another
one thing or person after another	one to a customer
one too many	one up
one way or another	one way or the other
one-armed bandit	one-banana problem
do an about-face	one-eyed pants mouse