apretar - to be too tight; to squeeze; to tighten [up]; to press [down/against]
arreglar - to arrange, settle, fix up, repair, tidy up
arrepentirse - to repent, be repentant, regret
arrojar - to throw, hurl, cast, toss
asistir - to attend
aspirar - to breath in, inhale; to suck in; to aspirate; to aspire
asustar - to frighten, scare, startle
asustarse - to be frightened [oneself]
atacar - to attack
atender - to attend to, pay attention to
