Approval.
A nomination.
An instance of inclining the head up and down, as to indicate agreement, or as a cursory greeting.
A reference or allusion to something.
To signify by a nod.
To incline the head up and down, as to indicate agreement.
To allude to something.
To sway, move up and down.
To make a mistake by being temporarily inattentive or tired
To briefly incline the head downwards as a cursory greeting.
To fall asleep while under the influence of opiates.
To gradually fall asleep.
To head; to strike the ball with one's head.
Objection.
A difficulty that has to be resolved or dealt with.
A puzzling circumstance.
A set of moves required to complete a climb.
A question to be answered, schoolwork exercise.
Difficulty in accepting or understanding or refusal to accept or understand.
Causing a problem; problematic; troublesome.
Difficult to train or guide; unruly.