cave in
动词中文： 屈服、落磐
- To collapse inward or downward. · The roof caved in under the weight of the snow.
- To cause to collapse inward or downward. · He caved in the side of the barrel with a single well-placed kick.
- To relent; to grant approval against one's initial will. · After he asked me a few times, I finally caved in and had a slice of cake.
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