1- Keel over
2- Key down
3- Key in
4- Key in on
5- Key on
6- Key out
7- Key to
8- Key up
9- Keep down
10- Keep on
11- Keep out (of)
12- Keep across
13- Keep around
14- Keep at
15- Keep away (from)
16- Keep back
17- Keep from
18- Keep in
19- Keep in with
20- Keep off
21- Keep to
22- Keep up
23- Keep up at
24- Keep up with
25- Keep going
26- Kick about
27- Kick around
28- Kick around with
29- Kick back
30- Kick down
31- Kick in
32- Kick off
33- Kick out
34- Kick up
35- Kill off
36- Kip down
37- Kip down on
38- Kiss off
39- Kiss up to
40- Knock about
41- Knock around
42- Knock back
43- Knock down
44- Knock it off
45- Knock off
46- Knock out
47- Knock over
48- Knock together
49- Knock up
50- Knuckle down
51- Knuckle under