Possible Results:
estaba siseando
-I was hissing
Imperfect progressive yo conjugation of sisear.
Imperfect progressive él/ella/usted conjugation of sisear.

sisear

INTRANSITIVE VERB
(to make an "s" sound)-to hiss
Synonyms for sisear
TRANSITIVE VERB
(to make an "s" sound at)-to hiss at
Synonyms for sisear
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stuffing