undertook
v.v. started a task or a job, especially one that takes a long time or is difficult.
v. the past tense of 'undertake'; refers to having committed oneself to and begun a specific task, responsibility, or journey.
She undertook the difficult task of cleaning the entire house.
The university undertook a massive renovation project to modernize the science labs before the new semester.
The explorers undertook a perilous journey across the frozen tundra, knowing that their supplies would barely last until they reached the coastal outpost.
Transitive; requires a direct object representing the task or responsibility.
He has undertook the workHe has undertaken the workLearners often confuse the past tense 'undertook' with the past participle 'undertaken' in perfect tenses.