| Idiom | Meaning | Example | 
| lose it | 
lose the ability to think clearly, become forgetful
 | 
After 35 years of teaching, he was losing it. He was confused.
 | 
| lose my train of thought | 
forget my order of thoughts or words
 | 
Don't interrupt me because I may lose my train of thought.
 | 
| lose out | 
lose a chance, fail to take advantage of
 | 
If I don't apply now, I'll lose out. This is my last chance.
 | 
| lose patience | 
not be patient any longer, out of patience
 | 
Mom is losing patience with us because we don't obey her.
 | 
| lose sight of | 
forget about, not remember the purpose
 | 
Let's not lose sight of why we're picking berries - to make pies.
 | 
| lose time | 
waste time, fall behind
 | 
We lost time when the car stalled. We were delayed.
 | 
| lose track | 
forget how many you have, lose count
 | 
He tried to count the number of birds, but he soon lost track.
 | 
| lose your appetite | 
not feel hungry anymore, lose the desire to eat
 | 
If a bug crawled out of your apple would you lose your appetite?
 | 
| lose your cool | 
lose control of emotions, lose your temper
 | 
Don't you ever lose your cool? Don't you ever get angry?
 | 
| lose your head | 
lose your ability to think clearly
 | 
If you become lost, don't lose your head. Be sensible.
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