Idioms and Phrases with to no avail
to no avail
Also, of little or no avail. Of no use or advantage, ineffective, as in All his shouting was to no avail; no one could hear him, or The life jacket was of little or no avail. This idiom uses avail in the sense of “advantage” or “assistance,” a usage dating from the mid-1400s. Also see to little purpose.