We have no meanings for "became swifter" in our records yet.
1 The river became swifter , and the scenery more pleasing than before.
2 The Churchill narrowed and its current became swifter as they progressed.
3 The current became swifter , and they fought to get closer in.
4 By the third day the river narrowed and became swifter .
5 Numbers grew, and with increasing number the pace became swifter .
6 Afterwards his approach became swifter and more stealthy.
7 But the current became swifter and stronger.
8 As soon as a view was obtained of this beacon, the progress of the adventurers became swifter and more certain.
9 The face of every one was turned toward the distance and as they pressed forward John's pace unconsciously became swifter .
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