slingshot

Short definition from Wiktionary

Noun

1. 1
   A Y-shaped stick with an elastic sling between the arms used for shooting small projectiles.
2. 2
   A stationary, often triangular object that launches any ball that hits its longest side back at a high force, now usually located above the flipper and between it and the inlane, with one each for both lower flippers.
3. 3
   A sling bikini.
4. 4
   An implement of a broad fabric worn around and connecting both bicipites brachii to support benching the most heavy weights.
5. 5
   The act of passing cars queuing in the left-hand lane and using the right-hand lane to go around a roundabout, exiting at the desired junction having avoided the queue.
6. 6
   Synonym of slingshot effect.

Verb

1. 1
   To move or cause to move in a manner resembling a projectile shot from a slingshot.
2. 2
   To use the gravity of a moving planet to add momentum to a spacecraft.
3. 3
   To perform the slingshot manoeuvre (see Noun).