bonsai UK /ˈbɒnsaɪ/US /ˈbɑnsaɪ/noun 2verb 1forms 3 noun2 •A tree or plant that has been miniaturized by planting it in a small pot, restricting its roots, and by careful pruning. •The art of planting and growing trees or plants in such a manner. verb1 •To make into a bonsai by restricting the roots and pruning.Could I be a father who was, so to speak, bonsaiing his children, trimming urban roots, and then twisting the emerging branches? — 2001 formsbonsaied · bonsaiing · bonsais