kneel

Short definition from Wiktionary

Verb

1. 1
   To rest on one's bent knees, sometimes only one; to move to such a position.
2. 2
   To sink down so that the entrance is level with the pavement, making it easier for passengers to enter.
3. 3
   To cause to kneel.
4. 4
   To rest on (one's) knees.