| 1 | jazz club |
| 2 | jazz record |
| 3 | just a minute |
| 4 | keep an eye (out) on (sth.) (for sb.) |
| 5 | keep an eye on |
| 6 | keep current on |
| 7 | keep doing sth. |
| 8 | keep in shape |
| 9 | keep it between the two of us |
| 10 | keep on |
| 11 | keep sb. from doing sth. |
| 12 | keep one's opinions to oneself |
| 1 | keep to oneself |
| 2 | keep track of |
| 3 | keep up |
| 4 | keep up with |
| 5 | kill time |
| 6 | knock oneself out on sth. |
| 7 | know a thing or two lab hour |
| 8 | lab hour |
| 9 | lab report |
| 10 | language lab |
| 11 | language laboratory |
| 12 | laundry detergent |
| 1 | law school |
| 2 | lay off |
| 3 | learn the ropes |
| 4 | leave…up to sb. |
| 5 | leave for someplace |
| 6 | leave no stone unturned |
| 7 | leave well enough alone |
| 8 | leave…around |
| 9 | lecture hall |
| 10 | left over |
| 11 | leg injury |