soap bush, noun phrase
Any of several species of shrubby plant formerly used for making soap. See also ganna.
1838 J.E. Alexander Exped. into Int. I. 83I found his three fresh and strapping daughters boiling soap, prepared with fat and the branches of the soap-bush.
1987 M. Poland Train to Doringbult 63The afternoon light was harsh. Even the soap bushes were withered, casting short, dry shadows.
Any of several species of shrubby plant formerly used for making soap.

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