From Longman Dictionary of Contemporary Englishtouch bottomtouch bottoma) HEOto reach the ground at the bottom of a sea, river etc He swam down but could not touch bottom. b) WORSEto reach the lowest level or worst condition The housing market has touched bottom. → touch
Examples from the Corpus
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. 