arriesgar - to risk, to take a risk
arrodillar - to kneel
arrollar - to roll, to knock down
arrugar - to wrinkle, to crumple up, to crease
arruinar - to ruin, to wreck
asar - to roast
ascender - to ascend, to promote
asear - to clean, to straighten, to tidy up
asediar - to besiege
asentir - to nod
asesorar - to advise, to counsel