v draw into the mouth by creating a practical vacuum in the mouth
v draw something in by or as if by a vacuum
v attract by using an inexorable force, inducement, etc.
v be inadequate or objectionable
v provide sexual gratification through oral stimulation
v take in, also metaphorically
v give suck to
v. 吸, 吮；吸收；吞没（suck的过去分词）