by hand
a mano
at the latest
a más tardar
often, many a time
a menudo
by rule of thumb
a ojo de buen cubero
without anything to go with it
a palo seco
in spite of
a pesar de
by the way
a propósito
at the brink of, about to
a punto de
I bet
a que…
inflexibly, rigorously, strictly
a raya tabla
unwillingly, complaining
a regañadientes
out with the old, in with the new
a rey muerto, rey puesto
without constraint
a rienda suelta
alone, by one’s self
a solas
guiding oneself by feeling
a tientas
at all cost
a toda costa
very fast
a toda máquina
by all appearances, clearly
a todas luces
with luxury
a todo trapo
very fast, as fast as possible
a todo vapor