| Answer | Crossword Clue |
|---|---|
| counterstrokes | COUNTERSTROKE, a stroke in return |
| counterstroke | a stroke in return |
| scavenges | Remove (combustion products) from the cylinder of an internal combustion engine on the return stroke of the piston |
| scavenging | Remove (combustion products) from the cylinder of an internal combustion engine on the return stroke of the piston |
| scavenged | Remove (combustion products) from the cylinder of an internal combustion engine on the return stroke of the piston |
