apply oneself

Also found in: Idioms.
References in periodicals archive ?
Which phrase, meaning to apply oneself to a task, is said to derive from the posture struck before delivering a shot in marbles?
One had to know oneself before one could apply oneself, be of use.
Some even tried to get away with, "Last night I dreamt I went to Manderley again", which was the opening move on how seriously one was going to apply oneself in the months ahead.