n. 标志；符号（sign的复数）

n a perceptible indication of something not immediately apparent (as a visible clue that something has happened)

n a public display of a message

n any nonverbal action or gesture that encodes a message

n structure displaying a board on which advertisements can be posted

n (astrology) one of 12 equal areas into which the zodiac is divided

n (medicine) any objective evidence of the presence of a disorder or disease

n having an indicated pole (as the distinction between positive and negative electric charges)

n an event that is experienced as indicating important things to come

n a gesture that is part of a sign language

n a fundamental linguistic unit linking a signifier to that which is signified

n a character indicating a relation between quantities

v mark with one's signature; write one's name (on)

v approve and express assent, responsibility, or obligation

v be engaged by a written agreement

v engage by written agreement

v communicate silently and non-verbally by signals or signs

v place signs, as along a road

v communicate in sign language

v make the sign of the cross over someone in order to call on God for protection; consecrate