This is the 4662nd most frequent Japanese word.
撤退
"撤退" means "retreat" or "withdrawal."
The word "撤退" (tettai) here is used to describe the tactical withdrawal of enemy troops.
敵軍が撤退する兆候が見えた。
Signs of the enemy troops retreating became visible.
Here, "撤退" (tettai) is metaphorically used to indicate disengagement from a proposal or plan.
彼の提案から早急に撤退する必要がある。
It is necessary to quickly withdraw from his proposal.
In this sentence, "撤退" (tettai) refers to ceasing involvement in a project.