drop-by noun 1drop by verb 1forms 4 noun1 •A brief visit, especially (politics) for the purpose of attracting voters or motivating one's staff.About all George had scheduled during these long hours were a few delegation drop-bys, a duty he shared with other party luminaries, to motivate the troops for the fall campaign. — 2008 drop by verb1 •(informal) To visit informally and spontaneously.I dropped by on Thursday, but you were out. formsdropped by · dropping by · drops by · drop-bys