sharp thread meaning

[Design engineering] "A screw thread having a sharp crest and root, the included angle is usually 60?"

Adjective: sharp (sharper,sharpest)   shaa(r)p (of something seen or heard) clearly defined "a sharp photographic image"; "the sharp crack of a twig"...

Verb: thread    thred To move or cause to move in a sinuous, spiral, or circular course - weave , wind , meander , wander   Pass a thread through "thread ...

[American slang] Fig. a similar idea or pattern to a series of events.    All of these incidents are related. There is a common thread to all this.

[American slang] Fig. an outspoken or harsh manner; a critical manner of speaking.    He has quite a sharp tongue. Don't be totally unnerved by what he says or the way he says...

[American slang] Fig. a good and fast ability to make jokes and funny comments.    Terry has a sharp wit and often makes cracks that force people to laugh aloud at inappropria...

[Design engineering] See acme screw thread

[Design engineering] "The angle occurring between the sides of a screw thread, measured in an axial plane."

[American idiom] exactly at a named time. • You must be here at noon sharp. • The plane is expected to arrive at seven forty-five sharp.

In the position of greatest difficulty, danger, stress, etc, in any activity