The Clue
It may jackknife (4 letter answer)
The Answer
SEMI
Tags
Notes
The answer SEMI is seen frequently, appearing about once every 60 puzzles.
Related Clues
18-wheeler
Annual opener
Big hauler
Big rig
Biographical opening?
Conductor's beginning
Formal introduction?
Half denoter
Half: Prefix
Highway hauler
Interstate hauler
Interstate sight
Interstate truck
Kind of private
Numerical prefix
Partly: Prefix
Prefix with circle
Prefix with tone
Sort of, for starters
Teamster's rig
Teamster's transport
Tournament match
Tractor-trailer
Truck of a sort
Trucker's rig
Trucker's vehicle
Trucking rig
Big rig, for short
Big truck, for short
Prefix with colon or formal
Prefix with conscious or colon
Rest stop sight
Sight at a truck stop
It may deliver the goods
It may make a big haul
It's bad when it knifes
Definition
SEMI as a noun:
1. (semifinal, semi) = one of the two competitions in the next to the last round of an elimination tournament
2. (trailer truck, tractor trailer, trucking rig, rig, articulated lorry, semi) = a truck consisting of a tractor and trailer together
3. (semitrailer, semi) = a trailer having wheels only in the rear; the front is supported by the towing vehicle