reckon with
phrasal verbreckon with somebody/something 
- [usually passive] to consider or treat somebody/something as a serious opponent, problem, etc.
- They were already a political force to be reckoned with.
 
 - (usually used in negative sentences) to consider something as a possible problem that you should be prepared for synonym take something into account
- reckon with doing something I didn't reckon with getting caught up in so much traffic.
 - We have to reckon with an element of chance.