nod  
[nɑːd]
Definition:  1. A sign of assent or salutation or command. 2. The act of nodding the head. 3. Express or signify by nodding. 4. Lower and raise the head, as to indicate assent or agreement or confirmation. 5. Let the head fall forward through drowsiness.
Use 'nod' in a sentence:  
Now a study has found it really does help people nod  off if it is milked from a cow at night. You may nod  off while driving. For example, a nod  of the head means "yes" to most of us. He swallowed drily and nodded . I hope he'll give the nod  to the plan. Presently the watcher began to nod; his head drooped lower and lower, both men began to snore now. I asked him if he would help me and he nodded . They depart, with a smile and a nod , and we miss them, and feel resentful. But in Bulgaria and Greece a nod  means "no" and a shake of the head means "yes". 'Are you all right?' Laura nodded  dumbly. For Paris-Roubaix, a nod  to the famed French bicycle race, the couple used sweetcorn to represent the road event's notorious cobblestones. Pete and Jo were still in the land of Nod , so I went out for a walk in the morning sunshine. She gave a nod  and said, "I see." In Bulgaria and Greece a nod  means "no" and a shake of the head means "yes". She nodded  approval. As the night deepened, Huck began to nod , and presently to snore. He nodded  assent. The president nodded  to the crowd as he passed in the motorcade. She gave a nod  of assent. He looked at me and nodded , almost invisibly. He nodded  his head in hearty agreement. I asked where Steve was and she nodded  in the direction of the kitchen. He nodded  solemnly. When we're talking with others, we can nod  at the speaker from time to time to show that we're listening attentively. She nodded  in affirmation. You nod  and people know you are saying "Yes". Of course, in certain circumstances, a simple wave, nod  or smile may be appropriate. He nodded  his head sympathetically. He gave me an approving nod . A friendly nod  or a wave of acknowledgement in response to an act of courtesy helps to create an atmosphere of goodwill and tolerance so necessary in modern traffic conditions. Everything could be done by a nod  and a wink. He nodded  gravely as I poured out my troubles. The student began to nod  off during math class. In contrast, they might only respond to a girl's comments with a nod . I know people can replace these words with a smile or nod . We've been given the nod  to expand the business. They nodded  in silent agreement. She nodded  her head in agreement. She nodded  in agreement, and he saw he had carried his point. Her head nodded  in agreement. With a nod  and a smile, she took leave of her friends. He nodded  to signify that he agreed. Several people nodded  in approval. Don't let yon dog nod  off. She nodded  wisely. He sat nodding  in front of the fire. She nodded  at him to begin speaking. She nodded  as a sign for us to sit down. She could only nod , because her mouth was full. As boards scrutinize succession plans in response to shareholder pressure, executives who don't get the nod  also may wish to move on. He nodded  gratefully. The judge appeared to nod  off yesterday while a witness was being cross-examined. He nodded  absently, his attention absorbed by the screen. While listening,you can nod  your head to show you in favor of his/ her views.