C1 加快速度／加大力量／势头增强（等等）
to become faster, stronger, etc.
The bicycle gathered speed as it went down the hill. 下山时自行车速度越来越快。
Economic recovery is gathering pace. 经济复苏的速度加快了。
She held on tight as the train gathered speed.
It's to be hoped that the protest gathers momentum.
The movement has been gathering strength in recent months.
The campaign certainly seems to be gathering momentum.
See also: gather verb (COLLECT)