| Idiom | Meaning | Example | 
| mend fences | 
solve political problems, listen to voters
 | 
Every summer the politicians go home and try to mend fences.
 | 
| mental block | 
(See a mental block)
 | 
 | 
| mess up | 
do a bad job, ruin it, screw up
 | 
The manager messed up. He spent too much money on advertising.
 | 
| mess with | 
challenge, fight with, mix it up  with
 | 
We learned not to mess with the Mafia. Their revenge is deadly.
 | 
| messed up | 
depressed, dependent on drugs, not coping with life
 | 
At that point in his life, he was messed up on drugs and alcohol.
 | 
| mete out | 
administer, give according to the law or policy
 | 
It was his duty to mete out justice in the colony.
 | 
| middle ground | 
a position that is fair to both sides, a compromise, meeting of minds
 | 
The minister tried to find some middle ground between the nurses and the administrators.
 | 
| middle of the road | 
moderate, not extreme
 | 
Our education policy is middle of the road. The majority like it.
 | 
| middleman | 
(See the middleman)
 | 
 | 
| miffed | 
annoyed, not pleased, put out about, ticked off
 | 
Marnie was miffed when you swore at her cat. She said you
were rude.
 |