a babe in arms

a babe in the woods

a bad taste in my mouth

a bad time

a ball-park figure

a bare-faced lie

a barnburner

a barrel of laughs

a basket case

a bawling out

a bed of roses

a bee in her bonnet

a beehive of activity

a big rig

a big shot

a big wheel

a big wig

a bird in the hand is worth two in the bush

a bit at sea

a bit dense

a bit off/a bit mental

a bite to eat

a bitter pill

a black mark

a blackout (TV)

a blackout (war)

a blank look

a blast

a blessing in disguise

a blowout

a blowout

a bone to pick

a breath of fresh air

a breath of wind

a brick

a brick short

a brick short

a budding genius

a budding genius

a bull in a China shop

a bull in a China shop

a bun in the oven

a bun in the oven

a bunch of malarkey

a bunch of malarkey

a bundle of nerves

a bundle of nerves

a card

a card

a case of

a case of

a caution

a checkup

a chicken in every pot

a chin wag

a chip off the old block

a chunk of change

a clean bill of health

a cliff-hanger

a close call

a close shave

a clutch hitter (baseball)

a common thread

a contract out on

a coon's age

a crash course

a crush on

a crying shame

a cut above

a cut-up

a daredevil

a dead giveaway

a dead heat

a dead loss

a dead ringer

a different kettle of fish

a dime a dozen

a doggy bag

a dog's age

a dog's breakfast

a dog's life

a double-edged sword

a downer (sadness)

a drag

a dressing down

a drop in the bucket

a duke's mixture

a dust-up

a fair shake

a falling out

a false move

a far cry

a faraway look

a fat lip

a feather in your cap

a fifth wheel

a fighting chance

a fill-up

a fine line

a fine-toothed comb

a firm hand

a flash in the pan

a fleeting glance

a fly on the wall

a fool and his money are soon parted

a foregone conclusion

a free hand

a free-for-all

a freeze on

a fresh pair of eyes

a fresh start

a full house (cards)

a full plate

a gaggle of geese

a game one

a ghost of a chance

a go

a go-getter

a going concern,

a golden opportunity

a goner

a good arm

a good egg

a good head

a good sport

a grain of salt

a grain of truth

a grandfather clause

a handful

a handout

a hard day

a hard row to hoe

a hard time

a hassle

a head start

a heavy day

a heavy hitter

a heavyweight

a helping hand

a hill of beans

a hit

a holy pile

a hoot

a horse of a different color

a hot hand

a hot ticket

a hotdog

a hothead

a hotshot

a household name

a howling blizzard

a humdinger

a jim dandy

a keeper

a leg up

a level playing field

a lick and a promise

a lift

a little birdy told me

a little off

a little off

a little steep

a little thick

a long shot

a loose cannon

a losing streak

a lost cause

a lot of bunk

a lot of falderal

a lot on the ball

a lucky break

a lucky streak

a major

a man of few words

a man of the cloth

a marked man

a mental block

a month of Sundays