On the wrong tack
Following the wrong course of action.The leader of the meeting went on the wrong tack and caused much confusion.
On the same page
Thinking similarly about something.I was on the same page as my friend about our plans for a holiday.
Out-of-date
No longer current or in style.Computer equipment becomes out-of-date very quickly.
Out of courtesy
In order to be polite to someone.We phoned our customers out of courtesy to tell them about the late arrival of the products.
Out of control
Uncontrollable, wild.The soccer fans were out of control after their team won the championship.
Out of bounds
Outside the boundaries of a playing area.The ball was out of bounds and the boy had to go over the fence to get it.
Out of all proportion
Of an exaggerated proportion.The complaints of the students were out of all proportion to what the problem was.
Out of action
To not work or operate, to not be able to do something.The player will be out of action for many more weeks.
Out of a clear blue sky
Suddenly, without warning.The orders from our boss came out of a clear blue sky and everybody was surprised.
Out like a light
To have fallen asleep very quickly.I went to bed early last night and I was out like a light.