a bordo — on board

de continuo — continuously

a caballo — on horseback

de costumbre — customarily

a carrera abierta; a la carrera  — at full speed

de esta manera --- this way

a causa de --- due to, on account of, because of

de frente — head-on

a chorros — in abundance

de golpe — suddenly

a conciencia — conscientiously

de improviso — unexpectedly

a continuación — immediately after

de locura — foolishly

a destiempo — inopportunely, at the wrong time

de mala gana — unwillingly

a empujones — intermittently

de memoria — by memory

a escondidas — covertly, secretly

de modo que --- so that

a eso de --- at about (time)

de nuevo — again, anew

a gatas — on hands and knees

de ordinario — ordinarily

a la  vez que  --- at the same time

de pie --- standing

a la derecha — rightward

de pronto — suddenly

a la fuerza — by force of

de puntillas — on tiptoe

a la izquierda — leftward

de repente — suddenly

a la larga  — in the long run

de rodillas — kneeling

a las claras — clearly

de seguro que — certainly

a lo largo — lengthwise

de veras — truly, really

a mano — by hand, manually

de verdad — truthfully

a máquina — by machine

de vez en cuando — occasionally

a matacaballo — at breakneck speed

dentro de poco — shortly

a menudo — frequently

en balde — pointlessly

a pesar de --- in spite of

en broma — jokingly

a pie — on foot

en cambio — on the other hand

a regañadientes — unwillingly, reluctantly

en conciencia — honestly

a sabiendas — knowingly

en confianza — confidentially

a saltos — by jumping

en cuanto —  in regard to

a solas — alone, by oneself

en fuerza de —  by virtue of

a tiempo — on time, in time

en la actualidad — presently, now

a todas horas — continually

en particular — particularly

a todo maquina — at full speed

en secreto — secretly

a veces — sometimes

en seguida (enseguida) — immediately

abalanzarse sobre, to rush at or to fall on

en serio — seriously

abatirse sobre, to swoop down on

en vez de --- instead

acabar con, to put an end to

en voz alta — loudly (said of speaking)

al bordo de --  alongside

en voz baja — softly (said of speaking)

al fin — finally, in the end

encontrarse con, to meet or to run into

alegrarse de, to be happy about

interarse en o interarse por, to be interested in

ante todo — first of all

para que --- what for?

apostar por, to bet on

Para siempre --- forever

bajo control — under control

pensar en, to think about

bajo cuerda — underhandedly

por cierto — certainly

chocar con, to run into

por consiguiente — consequently

coger de, to hold by

por eso --- that is why

con audacia — daringly

por fin — finally

con bien — safely

por lo contrario — on the contrary

con cuentagotas — stingily

por lo general — generally, as a rule

con esperanza — hopefully

por lo menos --- at least

con frecuencia — frequently

por lo visto — apparently

con respecto --- regarding

por otro parte --- on the other hand

con suerte -- luckily

por poco --- almost

con tal de que --- provided (that), as long as

por suerte — luckily

con valor — courageously

por supuesto — of course

contar con, to count or depend on

por todas partes — everywhere

de buena (mala) gana — willingly, (unwillingly)

sin empacho — uninhibitedly

de carrera —  hastily

sin reserva — unreservedly

vacilar en — to hesitate before, col.- joke around, tease, flirt