deepen
v[I, Tn]
(cause sth to) become deep or deeper 变深; 使(某物)更深; 加深
The water deepened after the dam was built. 堤坝建成後水已加深.
The mystery deepens, ie becomes harder to understand. 这奥秘更难理解了.
deepen a channel 加深航道
the deepening colours of the evening sky 逐渐昏暗的暮色.