שָׁגַג
From LSJ
Μέμνησο νέος ὤν, ὡς γέρων ἔσῃ ποτέ → Iuvenis memento te fore aliquando senem → Bedenke jung schon, dass dereinst ein Greis du bist
English (Strong)
a primitive root; to stray, i.e. (figuratively) sin (with more or less apology): X also for that, deceived, err, go astray, sin ignorantly.