Know a thing or two (about someone or something)
To be well informed about someone or something.My father works in a software company and he knows a thing or two about computers.
A knockout
A very beautiful woman.The man said that the woman who he saw at the bus stop was a knockout.
Knock the props out from under (someone)
To destroy someone's confidence, to destroy someone's emotional or financial or moral base.The teacher knocked the props out from under the... Read more →
Knock (something) off knock off (something)
To finish something, to do something, to make something (often in haste or carelessly).The small furniture company is able to knock off tables... Read more →
Knock (something) back/down
To drink something (usually alcohol or medicine).The medicine tasted terrible but I was able to knock it down.
Knock (someone’s) block off knock off (someone’s) block
To hit someone very hard (in the head), to beat someone up.The man was very angry and threatened to knock the block off anyone who came near him.
Kith and kin
Friends and relatives.All of our kith and kin attended the anniversary for my parents.
Kit and caboodle
The entire amount of something, everything.I took the whole kit and caboodle of my fishing supplies when I went fishing.
Kiss up to (someone)
To flatter someone in the hope of getting a benefit or reward or a promotion.One of our co-workers always likes to kiss up to our supervisor.
Kiss (something) good-bye
To lose something."You can kiss your computer good-bye. It is totally destroyed."