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lighten up

 
Verb lighten up has 2 senses
  1. brighten, lighten up, lighten - make lighter or brighter; "The paint will brighten the room"
    --1 is one way to change, alter, modify
    Sample sentences:
    Somebody ----s something
    Something ----s something
  2. lighten, lighten up - become lighter; "The room lightened up"
    --2 is one way to change
    Sample sentence:
    Something ----s
light within light year light years lightable lightbox lightbulb lighted lighten lighten up lightend lightened lightening lightens lighter-than-air lighter-than-air craft lighter-weight lighter

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