“Keep someone at arm’s length”

“At a glance”

After a quick look.

“At loggerheads”

In strong disagreement.

“Catch someone off guard”

To surprise someone unexpectedly.

“At all costs”

No matter what happens or how difficult it is.

“Blind as a bat”

Unable to see well.

“At the eleventh hour”

At the last possible moment.

“At full tilt”

As fast or strongly as possible.

“Leave someone in the lurch”

To abandon someone when they need help.