to put forth maximum effort toward something, especially after not having done so.
对某事做出最大努力, 尤其是还没有这么做过; 全力以赴。
He'll have to buckle down to his work soon if he wants to pass these exams.
You can follow your dreams someday, but right now you need to buckle down and be responsible.
There was a time when Charles was coasting at school and I should have told him to buckle down.
When you buckle down and really explore the many facets of a possible innovation to the organization, you are more able to make well thought-out decisions.