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At/on/in (time)
At for time of day : We arrive at 2 p.m..
On for days and dates : The meeting is on Tuesday.
In for longer periods. : I will see you in a month.
We also say at night, at the moment, at Christmas
Expressions:
Level playing field
Dating back from the 1980's this term refers to fair competition. On a level playing field, no side has an advantage.
They wanted to negotiate the contract on a level playing field.
Murphy's Law
Generally meaning if anything can go wrong, it will.
The laptop broke before the presentation. It was Murphy’s law.