[1] : WordNet (r) 2.0

block out
     v 1: plan where and when songs should be inserted into a
          theatrical production, or plan a theatrical production
          in general
     2: prevent from entering; "block out the strong sunlight" syn:
         screen
     3: shield from light syn: mask
     4: indicate roughly; "we sketched out our plan"
see also:
screen mask 

[2] : Moby Thesaurus II by Grady Ward, 1.0

59 moby thesaurus words for "block out":
   adumbrate, block in, brief, carve, cast, chalk out, characterize,
   chisel, close, create, cut, delineate, detail, draft, efform,
   enumerate, fashion, figure, fix, forge, form, formalize, found,
   frame, hew, itemize, knead, knock out, lay out, lick into shape,
   line, mint, model, mold, number, obstruct, outline, parse, resolve,
   rough in, rough out, roughcast, roughhew, scan, schematize, sculpt,
   sculpture, set, shape, shroud, shut off, shut out, skeleton,
   sketch, stamp, tailor, thermoform, trace, work

Bale Out >> B Words
Bale Out, definition of term: Bale Out
bale+out_pag1.html

Bawl Out >> B Words
Bawl Out, definition of term: Bawl Out
bawl+out_pag1.html

Bear Out >> B Words
Bear Out, definition of term: Bear Out
bear+out_pag1.html

Bail Out >> B Words
Bail Out, definition of term: Bail Out
bail+out_pag1.html

Back Out >> B Words
Back Out, definition of term: Back Out
back+out_pag1.html

Air Out >> A Words
Air Out, definition of term: Air Out
air+out_pag1.html

Ask Out >> A Words
Ask Out, definition of term: Ask Out
ask+out_pag1.html

Act Out >> A Words
Act Out, definition of term: Act Out
act+out_pag1.html