1nod 
/ˈnɑ:d/ verb
nods; nod·ded; nod·ding /ˈnɑ:d/ verb 1 a : to move your head up and down as a way of answering “yes” or of showing agreement, understanding, or approval [no obj] ▪ She nodded when I asked her if she was ready. ▪ He nodded in agreement. [+ obj] ▪ He nodded agreement/approval. ▪ I asked her if she could hear me, and she nodded her head.
b : to move your head up and down as a signal to someone or as a way of saying hello or goodbye to someone [no obj] — often + to ▪ The guard nodded to us as we walked in. ▪ He nodded to his assistant to start the slide show. — often + at ▪ She nodded at us as she walked past. [+ obj] ▪ She nodded hello. 2 always followed by an adverb or preposition [no obj] : to slightly move your head in a specified direction
▪ “The bathroom is around the corner,” he said, nodding to the left. ▪ She nodded toward the dirty dishes and said she would get to them later. 3 [no obj] : to move up and down
▪ The tulips nodded [=bobbed, swayed] in the breeze.
b : to move your head up and down as a signal to someone or as a way of saying hello or goodbye to someone [no obj] — often + to ▪ The guard nodded to us as we walked in. ▪ He nodded to his assistant to start the slide show. — often + at ▪ She nodded at us as she walked past. [+ obj] ▪ She nodded hello.
▪ “The bathroom is around the corner,” he said, nodding to the left. ▪ She nodded toward the dirty dishes and said she would get to them later.
▪ The tulips nodded [=bobbed, swayed] in the breeze.
nod off
[phrasal verb] informal : to fall asleep
▪ I nodded off during his speech.
▪ I nodded off during his speech.
