Select the most appropriate meaning of the given idiom.

Against the clock

Rushed and short on time 

The most appropriate meaning of the idiom "against the clock" is rushed and short on time.

The idiom "against the clock" means to do something as quickly as possible, usually because there is a deadline or a limited amount of time. It is often used in sports, but it can also be used in other situations, such as when someone is trying to finish a project or an assignment before a deadline.

For example, you might say "I'm working against the clock to finish this project." or "The runners were racing against the clock to win the race."

The other options are not as appropriate. To take on a task that is too big is not the same as working against the clock. To be on the point of achievement means to be close to completing something, which is not necessarily the same as working against the clock. To avoid talking is not the same as working against the clock.