I. noun a short, high-pitched sound emitted by electronic equipment or a vehicle horn. • leave a message after the beep.
II. verb — [no obj.] 1. (of a horn or electronic device) produce a beep. • the machines were beeping and the tills humming.
2. [with obj.] —
(chiefly N. Amer.) summon (someone) by means of a pager.
• they have themselves beeped in restaurants.
– origin 1920s: imitative.