sec
n. countable B1 Intermediate US //ˈsɛk// sec
n. a very short period of time. You use it when you want someone to wait for a moment.
n. a brief, unspecified interval of time. Informal in register; functions as a clipped form of 'second'.
Wait a sec while I grab my keys.
I will be with you in a sec; I just need to finish this email.
The technician asked the manager to hold on for a sec while he checked the server logs for any unusual activity.
Usage
Commonly used in the phrases 'in a sec' or 'for a sec'.