What are the antonyms for SLACKEN?

Synonyms for SLACKEN

Usage Examples for SLACKEN

  1. At her signal the oarsmen drew up alongside, and, scarce waiting for either boat to more than slacken speed, the nimble- footed girl sprang lightly to the deck of her father's galley. - "Historic Girls" by E. S. Brooks
  2. Langhetti was puzzled, and, as he said, bewildered, but he did not slacken a single effort to make his opera successful. - "Cord and Creese" by James de Mille