calumniator.

backbiting, n. defamation, vilification, traducement, calumny,
slander (secret).

backbone, n. spine, spinal column, rachis, chine. Associated Words:
vertebræ, Vertebrata, vertebra, vertebral spinal. See spine.

backbone, n. moral principle, steadfastness, stability, firmness,
stamina.

backboned, a. vertebrate, vertebrated. Antonyms: invertebrate,
invertebrated.

backdown, n. surrender, recession, withdrawal.

backhouse, n. outhouse, privy, necessary, water-closet, jakes,
latrine (in camp or hospital).

backing, n. support, coöperation, seconding, assistance, subsidy.

backing out. withdrawal, retreat, recession, retirement.

back out. (Colloq.) withdraw, retreat, resile, recede, retire.

backset, n. discouragement, setback, check, repulse, rebuff.

backslide, v. break faith, apostatize, retrograde, relapse, desert,
fall away.