In Salsa, the term "gancho" is used in two senses.
One is a synonym of the Hook Turn.
Another one is an arm action, usually performed by the man. The man holds the lady's left hand by his right hand at approximately the shoulder level, the joined arms are bent in the elbows. With hands still joined, the man hooks his elbow by a motion from the inside to the outside over the lady's arm and slightly presses the inside of his arm to the outside of the lady's arm, drawing the lady closer.
This gancho action may be done by the either arm or by both arms, either simultaneously or in turn. The hand grip may either be kept, or immediately released after the hook. Exits from the resulting position vary.