suck

(Informal) To flatter someone excessively to gain favour.

"He always sucks up to the manager."

(Informal) To be very bad, unpleasant, or of poor quality.

"This new policy really sucks."

To draw liquid, air, or food into the mouth by contracting lips and tongue.

"The baby sucked its thumb contentedly."

An act or instance of drawing something into the mouth.

"He took a long suck on his cigarette."