2VERB 变密集;变浓密 If something thickens, it becomes more closely grouped together or more solid than it was before. 变密集;变浓密
The crowds around him began to thicken. [VERB]
他四周的人群密集起来。
As the ice sheet grows and thickens it chills the nearby air. [VERB]
随着冰盖越来越大,越来越厚,周围的空气也冷了起来。
3PHRASE 情况愈发复杂起来 People sometimes say 'the plot thickens' when a situation or series of events is getting more and more complicated and mysterious. 情况愈发复杂起来
'Find anything?' he asked. 'Yeah. The plot thickens,' I said.