just a second

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun literally Only one second; a passage of time one-sixtieth of a minute in duration.
• noun idiomatic A short period of time, typically anywhere from a few seconds to several minutes or more.
• interjection idiomatic Stop; wait. Used to indicate that the speaker wishes the previous speaker or the proceedings to stop so that he or she can comment on what has been said or has happened so far.