Striving, Risking, or Revealing (On)

to direct one's attention, energy, or efforts toward a particular goal, task, or objective

The students were focusing on their final exams this past month.

to provide information to law enforcement or authorities about someone's actions, particularly illegal or unethical actions

He decided to inform on his neighbor, who had been involved in a series of burglaries.

to demand something firmly and persistently

The customer insisted on a replacement for the damaged product.

to reveal information that was meant to be kept a secret

He let on that he knew about the promotion before anyone else.

to give away information one has obtained about someone, particularly to someone in authority

He told on his classmates when he saw them cheating on the test.

to watch an event or incident without getting involved

Passers-by simply looked on as the two men argued heatedly on the sidewalk.

to secretly observe someone or something with the intention of gathering confidential or hidden information

The detective decided to spy on the suspect to gather evidence for the case.

to focus one's effort, time, or attention on something in order to achieve a particular goal

She's working on a solution to address the recurring issues in the system.