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

pisar

TRANSITIVE VERB
(to put your foot on)-to step on
Synonyms for pisar
TRANSITIVE VERB
(to trample)-to tread down
Synonyms for pisar
TRANSITIVE VERB
(to come into)-to set foot in
Synonyms for pisar
Antonyms for pisar
INTRANSITIVE VERB
(to walk)-to tread
Synonyms for pisar
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