What is the meaning of the underlined phrase? This is twelve. It's twelve o'clock. Twelve things have fallen. A man was hit twelve times.

It's twelve o'clock

Explanation:

The meaning of the underlined phrase is, It's twelve o'clock or B

The underlined phrase is an old English word for expressing the time of the day. At that time, the wall clock use is the pendulum type, that will sound at each hour and count out the number of the hours. That is why the word 'strike' was used with time during that period.