大肆

dàsì
  1. wantonly
  2. without restraint (of enemy or malefactor)
  3. unbridled

CEDICT

Entry Composition

1 大 dà
  1. big; large; great
  2. older (than another person)
  3. eldest (as in 大姐 dàjiě)
  4. greatly; freely; fully
  5. (dialect) father
  6. (dialect) uncle (father's brother)
2 肆 sì
  1. four (banker's anti-fraud numeral)
  2. unrestrained
  3. wanton
  4. (literary) shop