toil

Concise Oxford English Dictionary © 2008 Oxford University Press:
toil/tɔɪl/

▶verb work extremely hard or incessantly.

■ move slowly and with difficulty.

▶noun hard physical work.

– derivatives
toiler noun.

– origin ME: from Anglo-Norman Fr. toiler ‘strive, dispute’, toil ‘confusion’, from L. tudiculare ‘stir about’, from tudicula ‘machine for crushing olives’, rel. to tundere ‘crush’.