to fasten / to unfasten
Abrochar / Desabrochar
to speed up / to slow down
Acelerar / Desacelerar
to accompany / to leave alone
Acompañar / Desacompañar
to agree / to disagree
Acordar / Desacordar
to adapt / to maladapt
Adaptar / Desadaptar
to affect / to detach
Afectar / Desafectar
to agglutinate / to deagglutinate
Aglutinar / Desaglutinar
to tighten/adjust / to loosen/unadjust
Ajustar / Desajustar
to alarm / to calm
Alarmar / Desalarmar
to encourage / to discourage
Alentar / Desalentar
to align / to misalign
Alinear / Desalinear
to tie / to untie
Amarrar / Desamarrar
to animate/cheer / to discourage
Animar / Desanimar
to appear / to disappear
Aparecer / Desaparecer
to approve / to disapprove
Aprobar / Desaprobar
to arm/assemble / to disarm/disassemble
Armar / Desarmar
to tie / to untie
Atar / Desatar
to balance / to unbalance
Balancear / Desbalancear
to block / to unblock
Bloquear / Desbloquear
to embroider / to overflow
Bordar / Desbordar
to load / to unload
Cargar / Descargar
to ascend / to descend
Cender / Descender
to hang / to unhang
Colgar / Descolgar
to fix/compose / to break down
Componer / Descomponer