| Idiom | Meaning | Example | 
| long arm of the law | 
(See the long arm of the law)
 | 
 | 
| long for | 
wish for, want very much
 | 
Kelly longs for her home in the mountains. She's homesick.
 | 
| long gone | 
departed earlier, not here now
 | 
Albert was long gone by the time the RCMP arrived.
 | 
| long in the tooth | 
old, aged, over the hill
 | 
Jack is a good pitcher, but he's  long in the tooth - too old.
 | 
| long johns | 
winter underwear - with long sleeves and legs
 | 
If you are going cross-country skiing, put on your long johns.
 | 
| long time no see | 
I have not seen you for a long time
 | 
When I got off the bus, Grandpa said, "Long time no see."
 | 
| loo | 
(See the loo)
 | 
 | 
| look after | 
care for, take care of
 | 
He really looks after his car. It's in very good condition.
 | 
| look daggers | 
look angry, look with hateful eyes
 | 
Ginny looked daggers at me when I kissed her boyfriend.
 | 
| look down on | 
look as if you are better, look superior
 | 
Do some Americans look down on people from Canada?
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