| log off |
| Lone Ranger |
| long-felt |
| long hour |
| long row to hoe |
| long shot |
| long time no hear |
| look as if one had lost a shilling and found sixpence |
| look down upon |
| look forward to |
| look on |
| look on the dark side |
| look the other way |
| look to |
| loom large |
| loose ends |
| loosen the purse strings |
| lord of gingerbread |
| lose ground |
| lose one's battle |
| lose one's cool |
| lose one's heart |
| lose one's shirt |
| lose one's temper |
| lose one's touch |
| lose one's wits |
| lose the bell |
| lose the number of one's mess |
| lose touch |
| lost cause |
| lost in the shuffle |
| lost on |
| lost to time |
| love at first sight |
| love buzz |
| love it or lump it |
| love nest |
| low blow |
| lower the bar |
| low-hanging fruit |
| low on the totem pole |
| low-thoughted |
| luck of the draw |
| luck through |
| lucky dip |
| lucky duckling |
| lump in one's throat |
| lunatics have taken over the asylum |
| lush it up |
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Opera
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