| know-nothing |
an uninformed, ignorant person; ignoramus. [2 definitions] |
| known quantity |
(informal) a person, thing, attribute, or the like that is considered to be familiar or accepted. [2 definitions] |
| know of |
to be aware of; have heard about. |
| know the ropes |
(informal) to be or become acquainted with the techniques or procedures pertinent to a particular situation, organization, or the like. |
| know which side one's bread is buttered on |
to be very aware of what is advantageous to one. |
| knuckle |
any of the rounded joints of a finger, esp. the joint that connects the finger to the hand. [4 definitions] |
| knuckle ball |
in baseball, a slow pitch thrown with the knuckles or tips of two or three fingers pressed against the ball, causing it to waver and jump; knuckler. |
| knucklebone |
the rounded bone of a knuckle or joint. |
| knuckle down |
to start working in a concentrated manner; apply oneself seriously. |
| knucklehead |
(informal) a stupid, inept person; fool. |
| knuckle joint |
any joint between two bones that forms a knuckle. [2 definitions] |
| knuckle under |
to give in under pressure; yield. |
| knurl |
a knot or protuberance, as on a tree; gnarl. [3 definitions] |
| knurled |
having small ridges. [2 definitions] |
| knurly |
being full of knurls or knots; gnarled. |
| KO |
abbreviation of "knockout," in boxing, the act of defeating an opponent by knocking him down for a count of ten. (See technical knockout.) |
| koala |
a furry marsupial, native to Australia, that climbs trees and feeds on eucalyptus leaves and bark; koala bear. |
| koan |
in Zen Buddhism, a nonsense question or paradox used as an aid to meditation in order to encourage a greater awareness of reality. |
| kobo |
the smaller monetary unit of Nigeria. (Cf. naira.) |
| kobold |
in Germanic folklore, a spirit or elf that haunts households. [2 definitions] |
| Kodiak bear |
an extremely large brown bear of coastal Alaska and British Columbia. |