/spek; spɛk/
n (idm 习语) on `spec (infml 口) as a speculation or gamble, without being sure of obtaining what one wants 碰运气
*I went to the concert on spec
*I hadn't booked a seat. 我去听音乐会是碰运气, 因为没预订座位.

n informal
[Sense: 1; Date: 1900-2000; Origin: specification]
[Sense: 2; Date: 1800-1900; Origin: speculation]
[Sense: 3; Date: 1800-1900; Origin: spectacles]
[C usually plural]
a detailed instruction about how a building, car, piece of equipment etc should be made
= specification
　the specs for the company's new video games console
on spec
if you do something on spec, you do it without being sure that you will get what you are hoping for
　I sent in an application on spec.
specs [plural]
glasses that help you see