define phrases (locale blocks)

Where define phrase declares one key with variants, define phrases <locale> declares many plain keys at once, under a named locale. This is the localizable form (the same block stdlib uses) and the one to reach for when your text is a flat catalog of keyed strings rather than a single choice:

define phrases en-US
  rack-front:
    The front of every card is the same beaming flamingo.
  rack-back:
    Each back is pre-stamped, as if the zoo expects you to write home
    before you have even seen it.

Each entry is key: on its own line followed by an indented prose block. The block is dedent-terminated; there is no end phrases. A key here is a plain phrase with no strategy; for variants or a strategy, use define phrase instead. A key here is a single kebab-case word (dots are illegal, ADR-254). To override a standard-action message, use the parallel override messages <locale> block, whose keys are message aliases (taking-fixed-in-place:) rather than story phrase keys (ADR-255). Throughout this reference the small supporting texts live in exactly this kind of block at the foot of each fixture.