Synonyms for Giving some slack:

• v.

  •relent (verb)
  • go along with,
  • weaken,
  • give quarter,
  • cave in,
  • lay back,
  • fall,
  • give in,
  • give way,
  • slow,
  • give some slack,
  • die away,
  • cry uncle,
  • yield,
  • subside,
  • lighten up,
  • mellow out,
  • be merciful,
  • change one's mind,
  • go easy on,
  • capitulate,
  • ease off,
  • quit,
  • ease up on,
  • wane,
  • ebb,
  • soften,
  • forbear,
  • melt,
  • have mercy,
  • relax,
  • have pity,
  • comply,
  • cool it,
  • say uncle,
  • fold,
  • show mercy,
  • drop,
  • let it happen,
  • slacken,
  • acquiesce,
  • moderate,
  • ease,
  • give up,
  • come around,
  • let go.

Antonyms for Giving some slack:

• v.

  • relent
    increase, advance, ascend, continue, worry, rise, grow, free, build.