- troubleshoot (v.)
- also trouble-shoot, 1918 (implied in troubleshooting), probably a back-formation from troubleshooter.
- troubleshooter (n.)
- also trouble-shooter, 1898, originally one who works on telegraph or telephone lines. From trouble (n.) + agent noun from shoot (v.).
- troublesome (n.)
- 1540s, from trouble (n.) + -some (1). Troublesomeness.