To bite off more than you can chew is to take on more than you can manage. Do not bite off more than you can chew.
It is usually said as a warning before the fact rather than as a criticism after it. The picture is plain enough that no explanation is ever needed.
1phrasebite off more than you can chewTo take on more than you are able to manage.
“Taking both jobs was to bite off more than you can chew.”
bite off more than you can chew is a phrase.
Practised in Idioms