To come to terms or settle accounts with.
向…結(jié)算：與……解決或……結(jié)清帳目
a thing or person of considerable importance or ability that is not to be ignored or underestimated
不可小視的人（或物）
the trade unions were a political force to be reckoned with.
工會(huì)是一股不可小視的政治力量。
take (or fail to take) into account
（未）估計(jì)到，（未）考慮到；（未）預(yù)料到
they hadn't reckoned with a visit from Eunice.
他們沒有預(yù)料到尤妮斯的來訪。
(reckon with)(archaic)settle accounts with
(古)與…結(jié)算