Meaning of LOOP in English

I. loop 1 /luːp/ BrE AmE noun [countable]

[ Date: 1300-1400 ; Origin: Perhaps from Scottish Gaelic lub 'loop, bend' ]

1 . SHAPE OR LINE a shape like a curve or a circle made by a line curving back towards itself, or a piece of wire, string etc that has this shape

loop of wire/rope/string etc

A loop of wire held the gate shut.

belt loop (=a loop of material for holding a belt on trousers etc)

2 . COMPUTER a set of operations in a computer program that are continuously repeated

3 . FILM/MUSIC a film or music loop contains images or sounds that are continuously repeated

4 . be in the loop/be out of the loop informal to be or not be part of a group of people who make important decisions

5 . knock/throw somebody for a loop American English informal to surprise and upset someone

6 . ROAD/RAILWAY British English a road or railway line that leaves the main road or track and then joins it again further on

II. loop 2 BrE AmE verb

1 . [intransitive and transitive] to make a loop or make something into a loop

loop something over/around etc something

He looped the rope over the post.

2 . [intransitive] to move in a circular direction that forms the shape of a loop:

The ball looped over the goalkeeper into the back of the net.

3 . loop the loop to fly a plane up and around in a circle so that the plane is ↑ upside down for a time

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.