toil

Short definition from Wiktionary

Noun

1. 1
   Labour, work, especially of a grueling nature.
2. 2
   Trouble, strife.
3. 3
   A net or snare; any thread, web, or string spread for taking prey.
4. 4
   Initialism of time off in lieu (of monetary compensation for overtime).

Verb

1. 1
   To labour; work.
2. 2
   To struggle.
3. 3
   To work (something); often with out.
4. 4
   To weary through excessive labour.