Know how to use "fewer" and "less"? Find out.
1650s, earlier tricker (1620s), from Dutch trekker "trigger," from trekken "to pull" (see trek). Tricker was the usual form in English until c.1750. Trigger-happy is attested from 1943.
1930, from trigger (n.). Related: Triggered; triggering.
Quick to respond or react; touchy; sensitive (1940s+)
To ornament or adorn, often garishly •Also tricked-out as an adjective: He tricked out his ride