Related Clues:
- Struggle (through), as mud
- Long, hard grind
- Hit record following Sinatra's number one
- Hit hard — hard work
- Laborious process
- Uphill climb, say
- Left halfway through really good work
- Rough going
- Interminable task
- Make slo-o-o-ow progress
- Laborious task
- Long, tedious effort
- Laborious walk
- Grueling work
- Difficult endeavor