- Achilles heel
- accidie
- ad libitum
- apropos of
- ambrosial
- amateurishly
- aggravated
- aye aye
- as plain as a pikestaff
- arraign tell off
- abandon one's principles
- auster
- albatross
- agley
- a leg up
- at nay rate. conjunction although
- arouse one's curiosity
- at close quarters
- a muddle
- as plain as the nose on your face
- a rip-off
- amok
- a scrape
- AWOL
- a pickle
- argufy
- astronomic
- abide it
- abused
- absent oneself from
- all over the map
- as sound as a bell
- alky
- anti-Semitism
- aforethought
- a ball
- a considerable number
- assist be of assistance to
- anorexic
- as clear as mud
- a splash of
- a bundle of nerves
- amigo
- administrate
- an additional number
- a hoot
- amate-urrish
- airheaded
- acclimate
- an arm and a leg
- adulate
- a cakewalk
- as sharp as a tack
- advantageousness
- acting up
- a.s.a.p. as soon as possible
- acting-up
- area of expertise
- a wealth of
- an addition
- age spot
- a mess
- approachability
- all ears
- allaying
- a.s.s.p
- arch-
- arful
- attached to
- anatomize
- at the speed of light
- as near as dammit
- as plain as the nose on one's face
- a cinch
- a pinch of
- auditioner
- a goose egg
- acclivitous
- anti-Semitic
- a sprinkling of
- a clinch
- a murmur
- ageism
- altercate
- almost always
- a pretty kettle of fish
- as white as a sheet
- abounding in
- agreed
- all-year-round
- a shambles
- apple-polishing
- a load
- a scream
- amenability
- a breze
- at bottom
- alphabetize
- and collected
- at nay rate