air one's dirty laundry in public

abound in one's own sense

To follow one’s own inclinations and opinions.

ace up one's sleeve

A surprise advantage of which others are not aware.

act one's age

To behave in a manner appropriate to one's age.

act one's age, not one's shoe size

Synonym of act one's age (“to behave in a mature manner; to avoid being childish”).

afraid of one's own shadow

Exceptionally timid.

air one's dirty linen in public

Synonym of air one's dirty laundry in public.

air out

To expose to air; to leave open or spread out, as to allow odor or moisture to dissipate.

air rage

Aggressive, disruptive behaviour on an aircraft.