Explain away
Definition 1 of 1
Pro Tip 1/3Minimizing Impact
Used to make something seem less serious or negative by providing excuses or additional information. 
She tried to explain away the delay by mentioning the traffic jam.
Pro Tip 2/3Avoiding Blame
People often use this phrase to avoid taking responsibility for an issue or mistake. 
He attempted to explain away the error in the report as a software glitch.
Pro Tip 3/3Defensive Speech
It can be used defensively when someone feels the need to justify a fault or decision. 
She explained away her decision to go home early due to a sudden headache.