Peg away
Definition 1 of 1
Pro Tip 1/3Colloquial Use
Used in casual conversation, not in formal writing or speeches. 
She spent the weekend pegging away at her blog.
Pro Tip 2/3Continuous Effort
Implies ongoing effort over time, not just a single burst of energy. 
He's been pegging away at his thesis for months now.
Pro Tip 3/3Metaphorical Expression
Metaphorically refers to hammering pegs into something; symbolizes persistence. 
She keeps pegging away at her dream of becoming an actress.