touch bottoma) HEOto reach the ground at the bottom of a sea, river etc 触到水底 He swam down but could not touch bottom. 他潜下水，但是碰不到底。
b) WORSEto reach the lowest level or worst condition 达到最低点；落到最坏的地步 The housing market has touched bottom. 住宅市场已到最低谷。
touch bottom• The lake was too deep for their long poles to touch bottom.• Convictions have hardened, for better for worse, and the floaters have touched bottom.
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