[bats in one's belfry] or [bats in the belfry] {n. phr.}, […]

[batting average] {n. phr.} Degree of accomplishment (originally used as a […]

[battle of nerves] {n. phr.} A contest of wills during which […]

[bear in the air] or [bear in the sky] {n. phr.}, […]

[beaten path] {n. phr.} The usual route or way of operating […]

[bed of nails] {n. phr.} A difficult or unhappy situation or […]

[bed of roses] or [bowl of cherries] {n. phr.} A pleasant […]

[bed of thorns] {n. phr.} A thoroughly unhappy time or difficult […]

[bee in one's bonnet] {n. phr.}, {informal} A fixed idea that […]

[best bib and tucker] or [Sunday best] or [Sunday go-to-meeting clothes] […]