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[at sight] or [on sight]  {adv. phr.}

1. The first time the person or thing is seen; as soon as the person or thing is seen.

First graders learn to read many words on sight.

Mary had seen many pictures of Grandfather, so she knew him on sight.

 […]

[at sixes and sevens]  {adj. phr.}

Not in order; in confusion; in a mess.

He apologized because his wife was away and the house was at sixes and sevens.

Our teacher had just moved to a new classroom, and she was still at sixes and sevens.

*  […]

[at stake]  {adj. phr.}

Depending, like a bet, on the outcome of something uncertain; in a position to be lost or gained.

The team played hard because the championship of the state was at stake.

* /The farmers were more anxious for rain than the  […]

[at straws]

See: [GRASP AT STRAWS].

[at swords' points]  {adj. phr.}

Ready to start fighting; very much opposed to each other; hostile; quarreling.

The dog's barking kept the Browns at swords' points with their neighbors for months.

* /The mayor and the reporter were always at  […]

[at table]

See:

[AT THE TABLE];

[WAIT AT TABLE].

[at that]  {adv. phr.},  {informal}

1. As it is; at that point; without more talk or waiting.

Ted was not quite satisfied with his haircut but let it go at that.

2. In addition; also.

* /Bill's seat mate on the plane was a girl and a pretty one at  […]

[at the best]

See: [AT BEST].

[at the bit]

See: [CHAMP AT THE BIT].

[at the drop of a hat]  {adv. phr.},  {informal}

1. Without waiting; immediately; promptly.

If you need a babysitter quickly, call Mary, because she can come at the drop of a hat.

Compare: [ON THE SPUR OF THE MOMENT].

2. Whenever you have a chance;  […]