had been gelling

• past perfect progressive

  past perfect progressive

  Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.

  of gel.
  gel

  noun

  a semirigid colloidal dispersion of a solid with a liquid or gas, as jelly, glue, etc.

Related Words

• clot
• condense
• congeal
• curdle
• swell