“Kick into gear”

“By a hair”

By a very small amount.

“Beyond repair”

Too damaged to be fixed.

“Blaze a trail”

To be the first to do something new.

“Bide your time”

To wait patiently for the right moment.

“Behind closed doors”

Privately, not in public.

“Breathe easy”

To relax after worry or danger has passed.

“Burst someone’s bubble”

To disappoint someone by telling them the truth.

“Burn out”

To become exhausted from too much work or stress.