Definition of "shrub"
shrub1
/ʃɹʌb/
verb
third-person singular simple present shrubs, present participle shrubbing, simple past and past participle shrubbed
shrub2
/ʃɹʌb/
noun
countable and uncountable, plural shrubs
A liquor composed of vegetable acid, fruit juice (especially lemon), sugar, sometimes vinegar, and a small amount of spirit as a preservative. Modern shrub is usually non-alcoholic, but in earlier times it was often mixed with a substantial amount of spirit such as brandy or rum, thus making it a liqueur.