spark plug 
noun
A device for firing the explosive mixture in an internal combustion engine.Then, without the spark plug in place, pull the starter cord slowly, distributing the oil through the cylinder....
- Sedlack first tried to disable a snowmobile by pulling out a spark plug.
- He looked over at the battery and saw that the cap on a spark plug was loose.
- put (or have) someone's ass in a sling
- put (or have) the wind up
- put (or lay) one's cards on the table
- put (or lay) one's head (or neck) on the block
- put (or lay) on jam
- put (or place) a premium on
- put (or place) someone on a pedestal
- put (or set) one's hand to the plough
- put (or set) one's house in order
- put (or set) pen to paper
- put (or set) someone right
- put (or set) something to rights
- put (or set) spurs to
- put (or set) the cat among the pigeons
- put (or set) the record straight
- put (or set) the seal on
- put (or stick) one's oar in
- put (or throw) someone off the scent
- put out
- put out to grass
- put (out) to sea
- put paid to
- put-put
- putrefacient
- putrefact