had been hybridizing

• 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 hybridize.
  hybridize

  verb (used with object)

  to cause to produce hybrids; cross.

Related Words

• associate
• blend
• fuse
• incorporate
• infuse
• mingle
• stir
• weave