nāvārūḍhāś ca gacchanta ityādinā / nāvārūḍhavacanaṃ hi sakalayānārūḍhopalakṣaṇam /
[It has been explained] through [the example of] "those who have boarded a boat are going" and so forth. For the mention of "those who have boarded a boat" is meant to illustrate [those who have mounted] any kind of vehicle.