when wishing for luck, or
when telling a lie (and attempting to escape the moral and other consequence of that lie).
To put the middle finger across the index finger, especially
Often followed by for (a thing) or of (a person): to express an earnest or urgent plea.
To beg or plead that (someone) earnestly or urgently do something; to beseech, to entreat.
To beg or plead for (something) earnestly or urgently; to beseech.