Third-person singular simple present indicative form of drop by

A single drop (of a liquid).

A brief visit, especially (politics) for the purpose of attracting voters or motivating one's staff.

plural of dropful

Alternative spelling of drop-in.

(pharmacology) A dose of liquid medicine in the form of a drop (sense 1). / (pharmacology, chiefly in the plural) A liquid medicine that is intended to be administered in drops (sense 1).

(colloquial) To visit informally and spontaneously.

plural of drop

Third-person singular simple present indicative form of drop

(idiomatic) To arrive casually and unannounced, with little or no warning; also, to visit without an appointment. / (surfing) To paddle into and take off on a wave another surfer is already riding.