The word soltaran is the imperfect subjunctive form of soltar in the third person plural.
See the full soltar conjugation

soltar

to let go of
to loosen
TRANSITIVE VERB
(to stop holding)-to let go of
Synonyms for soltar
dejar caer
to drop
dejar escapar
to let go
dejar ir
to let go of
desabotonar
to unbutton
desabrochar
to unbutton
tirar al suelo
to drop on the ground
Antonyms for soltar
aferrar
to grasp
aferrarse a
to cling to
agarrar
to grab
asir
to grab
atrapar
to catch
empuñar
to grasp
mantener
to hold
sujetar
to hold
tomar
to take
apresar
to catch
atar
to tie
intentar agarrar
to snatch at
recoger
to pick up
succionar
to suck
tratar de agarrar
to grab at
TRANSITIVE VERB
(to make less tight)-to loosen
Synonyms for soltar
aflojar
to loosen
aflojarse
to loosen
desamarrar
to undo
desatar
to untie
relajar
to relax
zafar
to untie
arriar
to loosen
desabrocharse
to come undone
desenredar
to untangle
desenrollar
to unroll
deshacer
to undo
desligar
to untie
desprender
to detach
distender
to slacken
largar
to pay out
Antonyms for soltar
amarrar
to tie
anudar
to tie
atarse
to tie
abrochar
to fasten
agarrar
to grab
amarrar con correas
to strap
apretar
to tighten
atar con correas
to strap
enlazar
to tie
entrelazar
to intertwine
fijar
to fix
ligar
to tie
poner
to put
unir
to join
TRANSITIVE VERB
(to free)-to set free
Synonyms for soltar
liberar
to free
emancipar
to emancipate
liberarse
to liberate oneself
libertar
to set free
Antonyms for soltar
acorralar
to corral
atrapar
to catch
encadenar
to chain
encerrar
to lock up
raptar
to kidnap
uncir
to yoke
cazar con una trampa
to catch using a trap
emparedar
to wall up
poner en cuarentena
to quarantine
TRANSITIVE VERB
(to radiate)-to give off
Synonyms for soltar
desprenderse
to come off
emitir
to emit
manar
to drip with
arrojar
to throw
emanar
to emanate
Antonyms for soltar
absorber
to absorb
TRANSITIVE VERB
(to relinquish)-to give up
Synonyms for soltar
ceder
to give in
ceder
to transfer
Antonyms for soltar
atrapar
to catch
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