What is the meaning of Pettää?

to cheat, con, swindle, defraud

to deceive, delude, mislead

to betray

to cheat on (to be unfaithful to)

to fail, give way, break down, fall/tumble down (as of a structural part, a joint, or similar; also figuratively)

to let down, disappoint, desert, fail

to betray

to let down

to churn to form

Source: wiktionary.org