trigger

Originally tricker, from Dutch trekker (“pull”, noun, as in drawer-pull, bell-pull), from trekken (“to drag, draw, pull”).

• (UK) IPA^(key): /ˈtɹɪɡə/
• Rhymes: -ɪɡə(r)

trigger (plural triggers)

1. A finger-operated lever used to fire a gun.

   Just pull the trigger.

2. A similar device used to activate any mechanism.
3. An event that initiates others, or incites a response.

   Sleeping in an unfamiliar room can be a trigger for sleepwalking.

4. A concept or image that upsets somebody.

   I can't watch that violent film. Blood is one of my triggers.

5. (psychology) An event, experience or other stimulus that initiates a traumatic memory or action in a person.
6. (music) An electronic transducer allowing a drum, cymbal, etc. to control an electronic drum unit or similar device.
7. (music) A device that manually lengthens (or sometimes shortens) the slide or tubing of a brass instrument, allowing the pitch range to be altered while playing.
8. (electronics) A pulse in an electronic circuit that initiates some component.
9. (databases) An SQL procedure that may be initiated when a record is inserted, updated or deleted; typically used to maintain referential integrity.
10. (online gaming) A text string that, when received by a player, will cause the player to execute a certain command.
11. (archaic) A catch to hold the wheel of a carriage on a declivity.

• trigger-happy
• trigger point
• trigger warning

trigger (third-person singular simple present triggers, present participle triggering, simple past and past participle triggered)

1. (transitive) To fire a weapon.
   • 2011, Baggott, Jim, The First War of Physics, Pegasus Books, →ISBN:

     A U235 bomb would therefore need to incorporate a gun weighing ten tons. Then there was the question of initiating or triggering the bomb.

2. (transitive) To initiate something.

   The controversial article triggered a deluge of angry letters from readers.

3. (transitive, sensitive) To spark a response, especially a negative emotional response, in (someone).

   This story contains a rape scene and may be triggering for rape victims.

4. (intransitive, especially electronics) To activate; to become active.
   • 1997, Mill Operators' Conference, page 182:

     Sodium nitrite (750 ppm) was added after the alarm triggered at three hours, and corrosion did not occur for over eight hours.

• Among movements to promote mental health awareness, especially concerning autism; epilepsy; and post-traumatic stress disorder (PTSD), using the to spark an esp. negative emotional response in sense for lesser matters is often considered offensive to and exclusive of those who regularly deal with triggers that aggravate their symptoms (meltdowns; seizures, anxiety attacks; etc.).

• (fire a weapon): activate, detonate, fire
• (initiate something): activate, initiate
• (spark a response): push someone's buttons

• Trigger on Wikipedia.Wikipedia
• Database trigger on Wikipedia.Wikipedia

• trigger in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• trigger in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
• trigger at OneLook Dictionary Search