At it

1. In or near the area occupied by; in or near the location of: at the market; at our destination.

2. In or near the position of: always at my side; at the center of the page.

To or toward the direction or location of, especially for a specific purpose: Questions came at us from all sides.

Present during; attending: at the dance.

Within the interval or span of: at the dinner hour; at a glance.

In the state or condition of: at peace with one's conscience.

In the activity or field of: skilled at playing chess; good at math.

To or using the rate, extent, or amount of; to the point of: at 30 cents a pound; at high speed; at 20 paces; at 350°F.

On, near, or by the time or age of: at three o'clock; at 72 years of age.

On account of; because of: rejoice at a victory.

By way of; through: exited at the rear gate.

In accord with; following: at my request.

Dependent upon: at the mercy of the court.

Occupied with: at work.