Please tell me the meaning of 'yokire'.

This problem requires the calculation of the tangent.

She gave birth by cesarean section.

We vowed to see this project through to the end.

He played innocent by pretending he knew nothing.

He worked hard to overcome difficulties.

I decided to completely cut off my relationship with him.

Before getting on the train, the station staff punched my ticket.

I worked all day and ended up being tired out.

He cut the dam and started to let the water flow.