obsolete To knock one’s knees together while walking or running (i.e., be “knock-kneed”). Watch the video
Category: Idiom of the Day
a knife in the back
A grievous or supreme act of treachery or betrayal. (Usually preceding “of/for (someone).”) Watch the video
knick-knack
Any miscellaneous trinket or toy, especially one that is delicate or dainty. Watch the video
a knee-slapper
A hilarious joke, especially one that evokes loud and prolonged laughter. Watch the video
the knacker's yard
A state of ruin or failure due to having become useless or obsolete. Refers to a slaughterhouse for old or injured horses. Watch the video
keep out of sight
To remain unseen, as by hiding or evasion. Watch the video
keep mum
To remain silent; to not say anything (e.g., about a secret). Watch the video
keep in step with the times
To be, strive to be, or appear to be contemporary, fashionable, and/or relevant in modern times. Watch the video
keep an eye peeled (for something or someone)
To remain vigilant or carefully watchful (for something or someone). Watch the video
keep a sharp lookout (for something or someone)
To remain vigilant or carefully watchful (for something or someone). Watch the video