[f. prec.] intr. a. To swell into a bulb-like or rounded form. b. To form a bulb-shaped root.
1681. Cotton, Wond. Peak (ed. 4), 11. Bulbing out in figure of a sphere.
1846. Hannam, in Jrnl. R. Agric. Soc., VII. II. 589. The turnips did not bulb well.
1886. M. K. Macmillan, Dagonet the Jester, ii. 73. By m life how sweetly bulbeth out the figure of Psyche as she looks into the lamp.