The word pisáis is the present form of pisar in the second person plural.
See the full pisar conjugation

pisar

to step on
TRANSITIVE VERB
(to put your foot on)-to step on
Synonyms for pisar
pisotear
to trample on
aplastar
to crush
estrujar
to wring
TRANSITIVE VERB
(to trample)-to tread down
Synonyms for pisar
aplastar
to crush
hollar
to tread
TRANSITIVE VERB
(to come into)-to set foot in
Synonyms for pisar
entrar a
to enter
Antonyms for pisar
irse
to leave
INTRANSITIVE VERB
(to walk)-to tread
Synonyms for pisar
caminar
to walk
hollar
to tread
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