to mount up
01
乗る, 登る
get up on the back of
02
積み上がる, 徐々に増加する
to gradually increase in quantity or intensity over time
例
The bills started to mount up after she lost her job.
彼女が仕事を失った後、請求書が積み上がり始めた。
Tensions between the two groups began to mount up during the meeting.
会議中、二つのグループ間の緊張が高まり始めた。
