What is the meaning of Pettää?

to deceive, delude, mislead

to cheat, con, swindle, defraud

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)

to fail, err; be unsuccessful, untruthful

to let down, disappoint

to renege, betray, break

to betray

to let down

to churn to form

Source: wiktionary.org