Bal″last, v. t. [imp. & p. p.Ballasted; p. pr. & vb. n.Ballasting.] 1. To steady, as a vessel, by putting heavy substances in the hold.
2. To fill in, as the bed of a railroad, with gravel, stone, etc., in order to make it firm and solid.
3. To keep steady; to steady, morally.
'T is charity must ballast the heart.
Hammond.