“Cut and dried”

“Cut both ways”

To have both positive and negative effects.

“Catch someone off guard”

To surprise someone unexpectedly.

“Live and learn”

Used after learning from a mistake or experience.

“Every now and then”

Sometimes, but not often.

“Business as usual”

Things continuing in the normal way.

“Close call”

A situation where something bad almost happened.

“Cut it close”

To leave very little time before a deadline.

“Night and day”

Completely different.